Steps to Reproduce
The following empty Stack layout trips an assertion.
import 'package:flutter/widgets.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
MyApp() {
}
@override
Widget build(BuildContext context) {
return new Stack();
}
}Logs
I/flutter (24950): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (24950): The following assertion was thrown during performLayout():
I/flutter (24950): 'package:flutter/src/painting/alignment.dart': Failed assertion: line 513 pos 12: 'direction !=
I/flutter (24950): null': is not true.
I/flutter (24950):
I/flutter (24950): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter (24950): more information in this error message to help you determine and fix the underlying cause.
I/flutter (24950): In either case, please report this assertion by filing a bug on GitHub:
I/flutter (24950): https://github.com/flutter/flutter/issues/new
I/flutter (24950):
I/flutter (24950): When the exception was thrown, this was the stack:
I/flutter (24950): #2 AlignmentDirectional.resolve (package:flutter/src/painting/alignment.dart:513:12)
I/flutter (24950): #3 RenderStack._resolve (package:flutter/src/rendering/stack.dart:327:36)
I/flutter (24950): #4 RenderStack.performLayout (package:flutter/src/rendering/stack.dart:436:5)
I/flutter (24950): #5 RenderObject.layout (package:flutter/src/rendering/object.dart:1962:7)
I/flutter (24950): #6 RenderView.performLayout (package:flutter/src/rendering/view.dart:142:13)
I/flutter (24950): #7 RenderObject._layoutWithoutResize (package:flutter/src/rendering/object.dart:1837:7)
I/flutter (24950): #8 PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:1126:18)
I/flutter (24950): #9 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:262:19)
I/flutter (24950): #10 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:581:22)
I/flutter (24950): #11 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:200:5)
I/flutter (24950): #12 BindingBase&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:713:15)
I/flutter (24950): #13 BindingBase&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:649:9)
I/flutter (24950): #14 BindingBase&SchedulerBinding&GestureBinding&ServicesBinding&RendererBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/rendering/binding.dart:286:20)
I/flutter (24950): #16 _Timer._runTimers (dart:isolate-patch/dart:isolate/timer_impl.dart:367)
I/flutter (24950): #17 _Timer._handleMessage (dart:isolate-patch/dart:isolate/timer_impl.dart:401)
I/flutter (24950): #18 _RawReceivePortImpl._handleMessage (dart:isolate-patch/dart:isolate/isolate_patch.dart:163)
I/flutter (24950): (elided 3 frames from class _AssertionError and package dart:async-patch)
I/flutter (24950):
I/flutter (24950): The following RenderObject was being processed when the exception was fired:
I/flutter (24950): RenderStack#46ac0 NEEDS-LAYOUT NEEDS-PAINT
I/flutter (24950): creator: Stack ← MyApp ← [root]
I/flutter (24950): parentData: <none>
I/flutter (24950): constraints: BoxConstraints(w=1024.0, h=768.0)
I/flutter (24950): size: MISSING
I/flutter (24950): alignment: AlignmentDirectional.topStart
I/flutter (24950): textDirection: null
I/flutter (24950): fit: loose
I/flutter (24950): overflow: clip
I/flutter (24950): This RenderObject has no descendants.
I/flutter (24950): ════════════════════════════════════════════════════════════════════════════════════════════════════
Flutter Doctor
[✓] Flutter (on Mac OS X 10.13.1 17B48, locale en-CA, channel alpha)
• Flutter at /Users//flutter/flutter
• Framework revision e8aa40eddd (4 weeks ago), 2017-10-17 15:42:40 -0700
• Engine revision 7c4142808c
• Tools Dart version 1.25.0-dev.11.0
[✓] Android toolchain - develop for Android devices (Android SDK 25.0.3)
• Android SDK at /Users//Library/Android/sdk
• Platform android-25, build-tools 25.0.3
• ANDROID_HOME = /Users//Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.1, Build version 9B55
• ios-deploy 1.9.2
• CocoaPods version 1.3.1
[✓] Android Studio (version 2.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)
[✓] IntelliJ IDEA Community Edition (version 2017.2.5)
• Flutter plugin version 18.2
• Dart plugin version 172.4155.35
[✓] Connected devices
• SM T810 • 33003b44d0cd3317 • android-arm • Android 7.0 (API 24) (emulator)
Steps to Reproduce
The following empty Stack layout trips an assertion.
Logs
Flutter Doctor