_DraggableScrollableSheetState does not dispose extent. #133705
Description
PR that marks the leak: #133693
Steps to repro:
- Remove notDisposedAllowList added by the PR
- Run the updated test library with 'flutter run '
- Observe the test failure
I tried to invoke _extent.dispose() in dispose, but it caused some tests failing:
06:50 +8815 ~22: /b/s/w/ir/x/w/flutter/packages/flutter/test/material/scaffold_test.dart: Floating action button shrinks when bottom sheet becomes dominant
══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following assertion was thrown while finalizing the widget tree:
A ValueNotifier<double> was used after being disposed.
Once you have called dispose() on a ValueNotifier<double>, it can no longer be used.
When the exception was thrown, this was the stack:
#0 ChangeNotifier.debugAssertNotDisposed.<anonymous closure> (package:flutter/src/foundation/change_notifier.dart:179:9)
#1 ChangeNotifier.debugAssertNotDisposed (package:flutter/src/foundation/change_notifier.dart:186:6)
#2 ChangeNotifier.dispose (package:flutter/src/foundation/change_notifier.dart:375:27)
#3 _DraggableSheetExtent.dispose (package:flutter/src/widgets/draggable_scrollable_sheet.dart:609:18)
#4 _DraggableScrollableSheetState.dispose (package:flutter/src/widgets/draggable_scrollable_sheet.dart:723:13)
#5 StatefulElement.unmount (package:flutter/src/widgets/framework.dart:5669:11)
#6 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:2056:13)
#7 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:2054:7)
#8 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:5512:14)