src/rendering/semantics.dart: Failed assertion #10069
Description
Code:
import 'package:flutter/material.dart';
void main() {
runApp(new MaterialApp(
title: 'Flutter',
theme: new ThemeData(primarySwatch: Colors.red),
home: new MyHomePage()));
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String apikey;
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Flutter'),
),
body: new Center(
child: new Container(
padding: new EdgeInsets.all(20.0),
child: new Column(children: [
new TextField(
decoration:
new InputDecoration(labelText: 'Username')),
new TextField(
obscureText: true,
decoration: new InputDecoration(labelText: 'Password')),
new FlatButton(
onPressed: () {
var dialog = new SimpleDialog(title: new Text('hello'));
showDialog(context: context, child: dialog);
},
child: new Text('Login'),
)
]))));
}
}Error:
I/flutter (17028): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (17028): The following assertion was thrown during _updateSemantics():
I/flutter (17028): 'package:flutter/src/rendering/semantics.dart': Failed assertion: line 339 pos 16:
I/flutter (17028): 'seenChildren.add(child)': is not true.
I/flutter (17028):
I/flutter (17028): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (17028): more information in this error message to help you determine and fix the underlying cause.
I/flutter (17028): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (17028): https://github.com/flutter/flutter/issues/new
I/flutter (17028):
I/flutter (17028): When the exception was thrown, this was the stack:
I/flutter (17028): #2 SemanticsNode.addChildren.<anonymous closure> (package:flutter/src/rendering/semantics.dart:339:16)
I/flutter (17028): #4 SemanticsNode.addChildren (package:flutter/src/rendering/semantics.dart:336:12)
I/flutter (17028): #5 _InterestingSemanticsFragment.compile (package:flutter/src/rendering/object.dart:737:12)
I/flutter (17028): #6 _SyncIterator.moveNext (dart:core-patch/core_patch.dart:62)
I/flutter (17028): #7 List.addAll (dart:core-patch/growable_array.dart:197)
I/flutter (17028): #8 SemanticsNode.addChildren (package:flutter/src/rendering/semantics.dart:322:18)
I/flutter (17028): #9 _InterestingSemanticsFragment.compile (package:flutter/src/rendering/object.dart:737:12)
I/flutter (17028): #10 _SyncIterator.moveNext (dart:core-patch/core_patch.dart:62)
I/flutter (17028): #11 Iterable.single (dart:core/iterable.dart:501)
I/flutter (17028): #12 RenderObject._updateSemantics (package:flutter/src/rendering/object.dart:2495:88)
I/flutter (17028): #13 PipelineOwner.flushSemantics (package:flutter/src/rendering/object.dart:1200:16)
I/flutter (17028): #14 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:236:19)
I/flutter (17028): #15 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:361:22)
I/flutter (17028): #16 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:170:5)
I/flutter (17028): #17 BindingBase&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:685:15)
I/flutter (17028): #18 BindingBase&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:633:9)
I/flutter (17028): #19 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/rendering/binding.dart:247:20)
I/flutter (17028): #21 _Timer._runTimers (dart:isolate-patch/timer_impl.dart:366)
I/flutter (17028): #22 _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:394)
I/flutter (17028): #23 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:151)
I/flutter (17028): (elided 4 frames from class _AssertionError and package dart:async-patch)
Reloaded 1 of 425 libraries in 1,039ms.
I/flutter (17028):
I/flutter (17028): The following RenderObject was being processed when the exception was fired:
I/flutter (17028): RenderView#668411019
I/flutter (17028): debug mode enabled - android
I/flutter (17028): window size: Size(1440.0, 2392.0) (in physical pixels)
I/flutter (17028): device pixel ratio: 3.5 (physical pixels per logical pixel)
I/flutter (17028): configuration: Size(411.4, 683.4) at 3.5x (in logical pixels)
I/flutter (17028): semantics enabled
I/flutter (17028): This RenderObject had the following descendants (showing up to depth 5):
I/flutter (17028): RenderCustomPaint#324322237
I/flutter (17028): RenderPointerListener#734188547
I/flutter (17028): RenderAbsorbPointer#1018078217
I/flutter (17028): RenderSemanticsAnnotations#1033215741
I/flutter (17028): _RenderTheatre#482752555
I/flutter (17028): ════════════════════════════════════════════════════════════════════════════════════════════════════