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InspectorOverlayer failed assertion #6032
Description
When inspecting a widget using the standard setup from https://github.com/goderbauer/mvp, The following error occurs:
Exception
══╡ EXCEPTION CAUGHT BY SCHEDULER LIBRARY ╞═════════════════════════════════════════════════════════
The following assertion was thrown during a scheduler callback:
'package:flutter/src/foundation/math.dart': Failed assertion: line 12 pos 10: 'min <= max &&
!max.isNaN && !min.isNaN': is not true.
Either the assertion indicates an error in the framework itself, or we should provide substantially
more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=2_bug.yml
When the exception was thrown, this was the stack:
#2 clampDouble (package:flutter/src/foundation/math.dart:12:10)
#3 _TextPainterLayoutCacheWithOffset._contentWidthFor (package:flutter/src/painting/text_painter.dart:371:32)
#4 new _TextPainterLayoutCacheWithOffset (package:flutter/src/painting/text_painter.dart:332:22)
#5 TextPainter.layout (package:flutter/src/painting/text_painter.dart:1088:62)
#6 _InspectorOverlayLayer._paintDescription (package:flutter/src/widgets/widget_inspector.dart:3208:11)
#7 _InspectorOverlayLayer._buildPicture (package:flutter/src/widgets/widget_inspector.dart:3181:5)
#8 _InspectorOverlayLayer.addToScene (package:flutter/src/widgets/widget_inspector.dart:3132:18)
#9 Layer._addToSceneWithRetainedRendering (package:flutter/src/rendering/layer.dart:710:5)
#10 ContainerLayer.addChildrenToScene (package:flutter/src/rendering/layer.dart:1378:13)
#11 TransformLayer.addToScene (package:flutter/src/rendering/layer.dart:1997:5)
#12 ContainerLayer.buildScene (package:flutter/src/rendering/layer.dart:1130:5)
#13 RenderView.compositeFrame (package:flutter/src/rendering/view.dart:252:37)
#14 RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:596:20)
#15 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:960:13)
#16 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:457:5)
#17 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1297:15)
#18 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1227:9)
#19 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1085:5)
#20 _invoke (dart:ui/hooks.dart:189:13)
#21 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:442:5)
#22 _drawFrame (dart:ui/hooks.dart:159:31)
(elided 2 frames from class _AssertionError)
════════════════════════════════════════════════════════════════════════════════════════
I haven't nailed down the exact action that recreates it yet.
It should at least be one of the following:
- turn widget inspection off then on, click on the multi view app to inspect a widget
- turn widget inspection off then on, click on a widget the devtools widget tree,
When I narrow down the specific trigger I'll report back here
Activity
CoderDake commentedon Jul 13, 2023
I've tried to recreate this on the template app created by flutter create.
I've used the --local-engine, and used the default engine.
I was not able to reproduce with that app. So something tells me this has something to do with the way Widget inspectors exist in those multi view apps.
CoderDake commentedon Jul 13, 2023
It looks like this error pops up if you try to click any of the
Textwidgets in DevTools. This must be done before the any Widgets are selected on the app itself.CoderDake commentedon Jul 13, 2023
Retested with the local engine on the fresh single view flutter app. This error doesn't seem to happen.
So this makes me thing that something weird happens in the multi view apps, before the first inspection click on the app
CoderDake commentedon Jul 21, 2023
After doing some more debugging I found out that there is a 4th ghost view in the widget tree of the app, even though there are only 3 windows that open when the app is run.
As it turns out all of the errors I was running into were when clicking on widgets inside that ghost view, and then afterwards the inspection would be janky which made me thing all of the views were having issues.
So it looks like this error is happening when the view is too small to support that calculations that
_paintDescriptiondoes. Which is the case for this ghostview since the INspectorOverlayer thinks that the size of the selected object is (0,0).I talked to goderbauer about the ghost view and he mentioned that the extra ghost view is a flutter engine bug that they are working on.
CoderDake commentedon Jul 21, 2023
Flutter Engine issue that caused the Ghost View to show up:
flutter/flutter#131089
CoderDake commentedon Aug 2, 2023
Fixed in https://github.com/flutter/flutter/pull/129452/files#diff-f3f2945fbb3193cf8c53a711a4192a1ea75cea729c4316c7b3f9ae701c4bc079R3240