text:
[Regression][2.5]: Integration tests fail if wrapped with Semantics widgets (eg: MergeSemantics).

My Integration Tests work as expected when I use Flutter version 2.2.3.
However, when I try to run them using Flutter's version 2.5.0 or above, they fail.
It is a web application, and it randomly throws an exception that I haven't found anything related to yet.
Some of the first testWidgets tests pass successfully. But when the first exception is raised, all following testWidgets tests also fail and the console gets full of error messages. Although they fail, I can visually see them being completed as I expected. Sometimes, one of the latter tests "saves" the state of the previous test and thus, won't pass either. (Console of both cases - 2.2.3 and 2.5.0 -  is down below).
After some research, I found out that I have to set semanticsEnabled = false, as shown below:
 testWidgets('', (WidgetTester tester) async {}, semanticsEnabled: false);

When I use it like this, all tests pass as expected with Flutter greater than 2.5.0. However, I'll need to include semantics testing in a near future, so I won't be able to keep using  semanticsEnabled = false.
Console using Flutter 2.2.3
00:00 +0: Remote Configs |  (21542) Criar uma nova configuração com sucesso
Uncaught Error: Assertion failed: file:///Users/60003715/flutter/packages/flutter_test/lib/src/binding.dart:1551:16
hitTestResult != null
is not true
    at Object.throw_ [as throw] (dart_sdk.js:5041)
    at Object.assertFailed (dart_sdk.js:4980)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.dispatchEvent (_matchers_web.dart.js:3999)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.[_handlePointerEventImmediately] (binding.dart.js:321)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.handlePointerEvent (binding.dart.js:295)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.handlePointerEvent (_matchers_web.dart.js:3227)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.handlePointerEvent (_matchers_web.dart.js:3985)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.[_flushPointerEventQueue] (binding.dart.js:285)
    at integration_test.IntegrationTestWidgetsFlutterBinding.new.[_handlePointerDataPacket] (binding.dart.js:276)
    at Object.invoke1 (dart_sdk.js:175635)
    at _engine.EnginePlatformDispatcher.__.invokeOnPointerDataPacket (dart_sdk.js:157073)
    at _engine.PointerBinding.__.[_onPointerData] (dart_sdk.js:157712)
    at dart_sdk.js:158119
    at dart_sdk.js:158086
    at dart_sdk.js:157805
01:05 +1: Remote Configs |  (21705) Alterar a descrição de uma configuração remota
01:15 +2: Remote Configs |  (21708) Alterar a categoria de uma configuração remota
01:24 +3: Remote Configs |  (21709) Alterar as condições de uma configuração remota
02:10 +4: Remote Configs |  (21704) Validar que uma chave de uma configuração remota não pode ser alterada
02:17 +5: Remote Configs |  (21710) Apagar uma configuração remota
02:25 +6: Remote Configs |  (21555) Criar uma nova configuração com chave MAIOR que a esperada
03:05 +7: Remote Configs |  (21547) Criar uma nova configuração sem informar os parâmetros obrigatórios
03:11 +8: (tearDownAll)
03:11 +9: All tests passed!

Console using Flutter >= 2.5.0
developer_patch.dart:75 registerExtension() from dart:developer is only supported in build/run/test environments where the developer event method hooks have been set.
_registerExtension @ developer_patch.dart:75
developer_patch.dart:125 postEvent() from dart:developer is only supported in build/run/test environments where the developer event method hooks have been set.
_postEvent @ developer_patch.dart:125
00:00 +0: Remote Configs |  (21542) Criar uma nova configuração com sucesso
Some possible finders for the widgets at Offset(225.7, 278.4):
  find.byType(AnimatedModalBarrier)
  find.byType(Overlay)
  find.byType(AbsorbPointer)
  find.byType(Navigator)
  find.byType(AnimatedTheme)
00:59 +1: Remote Configs |  (21705) Alterar a descrição de uma configuração remota
01:07 +2: Remote Configs |  (21708) Alterar a categoria de uma configuração remota
01:15 +3: Remote Configs |  (21709) Alterar as condições de uma configuração remota
01:46 +3: Remote Configs |  (21542) Criar uma nova configuração com sucesso
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Parent #171 has child #167. However, the child is attached to #165."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Parent #171 has child #167. However, the child is attached to #165."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Parent #171 has child #167. However, the child is attached to #165."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Parent #171 has child #167. However, the child is attached to #165."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #168 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #168 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed:
org-dartlang-sdk:///flutter_web_sdk/lib/_engine/engine/semantics/semantics.dart:1144:16
child._parent == this
is not true

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 29:3    assertFailed
lib/_engine/engine/semantics/semantics.dart 1144:33                           [_updateChildrenInTraversalOrder]
lib/_engine/engine/semantics/semantics.dart 814:5                             updateWith
lib/_engine/engine/semantics/semantics.dart 1562:13                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #147 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
 dart-sdk/lib/async/zone.dart 1328:19                                          run
 dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
 lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 01:59 +3: Remote Configs |  (21709) Alterar as condições de uma configuração remota
 ══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
 The following message was thrown:
 Multiple exceptions (32) were detected during the running of the current test, and at least one was
 unexpected.
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 01:59 +3: Remote Configs |  (21709) Alterar as condições de uma configuração remota [E]
   Test failed. See exception logs above.
  The test description was: (21709) Alterar as condições de uma configuração remota

Consider enabling the flag chain-stack-traces to receive more detailed exceptions.
For example, 'dart test --chain-stack-traces'.
01:59 +3 -1: Remote Configs |  (21704) Validar que uma chave de uma configuração remota não pode ser alterada
02:00 +3 -1: Remote Configs |  (21542) Criar uma nova configuração com sucesso
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 600:14                         <fn>
dart-sdk/lib/async/zone.dart 1420:47                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
dart-sdk/lib/async/zone.dart 1276:23                                          <fn>
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1260:23                                          <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19       internalCallback
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
 dart-sdk/lib/async/zone.dart 1328:19                                          run
 dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
 lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
02:06 +3 -1: Remote Configs |  (21704) Validar que uma chave de uma configuração remota não pode ser alterada
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following message was thrown:
Multiple exceptions (11) were detected during the running of the current test, and at least one was
unexpected.
════════════════════════════════════════════════════════════════════════════════════════════════════
02:06 +3 -1: Remote Configs |  (21704) Validar que uma chave de uma configuração remota não pode ser alterada [E]
  Test failed. See exception logs above.
  The test description was: (21704) Validar que uma chave de uma configuração remota não pode ser alterada

Consider enabling the flag chain-stack-traces to receive more detailed exceptions.
For example, 'dart test --chain-stack-traces'.
02:06 +3 -2: Remote Configs |  (21710) Apagar uma configuração remota
02:07 +3 -2: Remote Configs |  (21542) Criar uma nova configuração com sucesso
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 600:14                         <fn>
 dart-sdk/lib/async/zone.dart 1420:47                                          _rootRun
 dart-sdk/lib/async/zone.dart 1328:19                                          run
 dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
 dart-sdk/lib/async/zone.dart 1276:23                                          <fn>
 dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
 dart-sdk/lib/async/zone.dart 1328:19                                          run
 dart-sdk/lib/async/zone.dart 1260:23                                          <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19       internalCallback
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
02:13 +3 -2: Remote Configs |  (21710) Apagar uma configuração remota
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following message was thrown:
Multiple exceptions (14) were detected during the running of the current test, and at least one was
unexpected.
════════════════════════════════════════════════════════════════════════════════════════════════════
02:13 +3 -2: Remote Configs |  (21710) Apagar uma configuração remota [E]
  Test failed. See exception logs above.
  The test description was: (21710) Apagar uma configuração remota

Consider enabling the flag chain-stack-traces to receive more detailed exceptions.
For example, 'dart test --chain-stack-traces'.
02:13 +3 -3: Remote Configs |  (21555) Criar uma nova configuração com chave MAIOR que a esperada
02:14 +3 -3: Remote Configs |  (21542) Criar uma nova configuração com sucesso
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 600:14                         <fn>
dart-sdk/lib/async/zone.dart 1420:47                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
dart-sdk/lib/async/zone.dart 1276:23                                          <fn>
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1260:23                                          <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/isolate_helper.dart 48:19       internalCallback
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
dart-sdk/lib/async/zone.dart 1328:19                                          run
dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #167 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Child #167 is missing in the tree."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
lib/_engine/engine.dart 440:45                                                <fn>
dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
════════════════════════════════════════════════════════════════════════════════════════════════════
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
Assertion failed: "Parent #75 has child #64. However, the child is attached to #65."

When the exception was thrown, this was the stack:
dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Parent #75 has child #64. However, the child is attached to #65."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Parent #75 has child #64. However, the child is attached to #65."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 dart-sdk/lib/async/zone.dart 1428:13                                          _rootRun
 dart-sdk/lib/async/zone.dart 1328:19                                          run
 dart-sdk/lib/async/zone.dart 1236:7                                           runGuarded
 lib/_engine/engine/platform_dispatcher.dart 1005:9                            invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Parent #75 has child #64. However, the child is attached to #65."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Parent #75 has child #64. However, the child is attached to #65."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1592:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #65 is missing in the tree."

 When the exception was thrown, this was the stack:
 dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 251:49  throw_
 lib/_engine/engine/semantics/semantics.dart 1584:15                           <fn>
 dart-sdk/lib/_internal/js_dev_runtime/private/linked_hash_map.dart 21:13      forEach
 lib/_engine/engine/semantics/semantics.dart 1576:22                           <fn>
 lib/_engine/engine/semantics/semantics.dart 1606:14                           updateSemantics
 lib/_engine/engine/platform_dispatcher.dart 621:35                            updateSemantics
 packages/flutter_test/src/window.dart.js 371:31                               updateSemantics
 packages/flutter/src/semantics/semantics.dart.js 2539:64                      sendSemanticsUpdate
 packages/flutter/src/rendering/layer.dart.js 5979:47                          flushSemantics
 packages/flutter/src/rendering/layer.dart.js 5190:28                          drawFrame
 packages/flutter/src/widgets/widget_inspector.dart.js 46738:15                drawFrame
 packages/flutter/src/rendering/layer.dart.js 5150:12                          [_handlePersistentFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 714:9                          [_invokeFrameCallback]
 packages/flutter/src/scheduler/binding.dart.js 686:37                         handleDrawFrame
 packages/flutter_test/src/deprecated.dart.js 5564:57                          handleDrawFrame
 packages/flutter/src/scheduler/binding.dart.js 643:12                         [_handleDrawFrame]
 lib/_engine/engine/platform_dispatcher.dart 1003:13                           invoke
 lib/_engine/engine/platform_dispatcher.dart 157:5                             invokeOnDrawFrame
 lib/_engine/engine.dart 440:45                                                <fn>
 dart-sdk/lib/async/zone.dart 1444:13                                          _rootRunUnary
 dart-sdk/lib/async/zone.dart 1335:19                                          runUnary
 dart-sdk/lib/async/zone.dart 1244:7                                           runUnaryGuarded
 dart-sdk/lib/async/zone.dart 1281:26                                          <fn>
 ════════════════════════════════════════════════════════════════════════════════════════════════════
 ══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
 The following assertion was thrown during a scheduler callback:
 Assertion failed: "Child #65 is missing in the tree."

@cervagiordano fwiw you may be interested in flutter/tests -- if your code is publicly accessible, you can submit a little file that makes us run your tests on every commit so that we won't break you again.

@darshankawar I'm trying to run your repro but it looks like it's missing test_driver/integration_test.dart? Am I doing something wrong?

@Hixie
Sorry for the inconvienence caused. Here's the test_driver/integration_test.dart file:
import 'package:integration_test/integration_test_driver.dart'
    show integrationDriver;

Future<void> main() => integrationDriver();

Well the good news is that this seems to be fixed on master, so the next stable should have this problem resolved.
@cervagiordano Can you confirm if this works for you on the channel master?

Also verified the same on latest master (Channel master, 2.6.0-12.0.pre.216), the console error doesn't occur without using semanticsEnabled: false, ie, the error / exception occurs only on latest stable versions from 2.5.0 onwards.

@Hixie Hi, yes, when I verified this earlier, I checked on master and it seems to work properly there.

Hi @cervagiordano, kindly confirm if this issue is solved for you on the latest master.
Thank you

authors: Hixie cervagiordano danagbemava-nc darshankawar