Issue while inspecting App bar and floating action button

[CoderDake]

While testing multi view i have noticed that trying to inspect the app bar or the floating action button results in a stack overflow error.

{"exception":"Stack Overflow","stack":"#0      _AssertionError._evaluateAssertion (dart:core-patch/errors_patch.dart:56:3)\n#1      _LinkedHashMapMixin._insert (dart:collection-patch/compact_hash.dart)\n#2      _LinkedHashMapMixin._set (dart:collection-patch/compact_hash.dart:519:7)\n#3      _LinkedHashMapMixin._insert (dart:collection-patch/compact_hash.dart:465:7)\n#4      _LinkedHashMapMixin._set (dart:collection-patch/compact_hash.dart:519:7)\n#5      DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1611:22)\n#6      DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#7      DiagnosticsProperty.toJsonMap (package:flutter/src/foundation/diagnostics.dart:2618:45)\n#8      FlagProperty.toJsonMap (package:flutter/src/foundation/diagnostics.dart:2120:45)\n#9      DiagnosticsNode.toJsonList.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1675:19)\n#10     new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189:27)\n#11     new _GrowableList.of (dart:core-patch/growable_array.dart:150:28)\n#12     DiagnosticsNode.toJsonList (package:flutter/src/foundation/diagnostics.dart:1676:8)\n#13     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1637:25)\n#14     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#15     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2057:62)\n#16     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#17     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#18     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#19     _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#20     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#21     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#22     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#23     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#24     _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#25     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#26     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#27     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#28     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#29     _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#30     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#31     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#32     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#33     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#34     _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#35     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#36     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#37     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#38     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#39     _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#40     WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#41     InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#42     DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#43     DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n...\n...\n#3263   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3264   WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#3265   InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#3266   DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#3267   DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#3268   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3269   WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#3270   InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#3271   DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#3272   DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#3273   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3274   WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#3275   InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#3276   DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#3277   DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#3278   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3279   WidgetInspectorService._getLayoutExplorerNode.<anonymous closure> (package:flutter/src/widgets/widget_inspector.dart:2065:61)\n#3280   InspectorSerializationDelegate.additionalNodeProperties (package:flutter/src/widgets/widget_inspector.dart:3627:53)\n#3281   DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1635:21)\n#3282   DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#3283   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3284   DiagnosticsNode.toJsonList.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1675:19)\n#3285   new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:189:27)\n#3286   new _GrowableList.of (dart:core-patch/growable_array.dart:150:28)\n#3287   DiagnosticsNode.toJsonList (package:flutter/src/foundation/diagnostics.dart:1676:8)\n#3288   DiagnosticsNode.toJsonMap.<anonymous closure> (package:flutter/src/foundation/diagnostics.dart:1643:23)\n#3289   DiagnosticsNode.toJsonMap (package:flutter/src/foundation/diagnostics.dart:1650:6)\n#3290   _ElementDiagnosticableTreeNode.toJsonMap (package:flutter/src/widgets/framework.dart:5076:45)\n#3291   WidgetInspectorService._nodeToJson (package:flutter/src/widgets/widget_inspector.dart:1656:18)\n#3292   WidgetInspectorService._getLayoutExplorerNode (package:flutter/src/widgets/widget_inspector.dart:2037:14)\n#3293   BindingBase.registerServiceExtension.<anonymous closure> (package:flutter/src/foundation/binding.dart:953:32)\n#3294   _RootZone.runUnary (dart:async/zone.dart:1661:54)\n#3295   _FutureListener.handleValue (dart:async/future_impl.dart:156:18)\n#3296   Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:840:45)\n#3297   Future._propagateToListeners (dart:async/future_impl.dart:869:13)\n#3298   Future._complete (dart:async/future_impl.dart:632:7)\n#3299   new Future.delayed.<anonymous closure> (dart:async/future.dart:424:16)\n#3300   Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)\n#3301   _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)\n#3302   _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)\n#3303   _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)\n","method":"ext.flutter.inspector.getLayoutExplorerNode"}

[CoderDake]

Looking into this more it appears that this happens with flutter master and a normal single view app, so I will mark this as just a widget inspector bug in general.

To recreate this:

• flutter create fresh_app
• cd fresh_app
• flutter run -d macos
• Open Devtools
• Turn on "Select Widget Mode"
• In the widget tree select FloatingActionButton
• You will notice the Layout Explorer doesn't update and after a little bit the stack overflow will occur.

[CoderDake]

Fixed by #5946