Make sure that a DisplayFeatureSubScreen doesn't crash in 0x0 environ…#180357
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This pull request adds a valuable test case for DisplayFeatureSubScreen that confirms a crash when the widget is constrained to a zero-sized area, as reported in issue #6537. The test is well-structured and effectively reproduces the issue.
However, the implementation to fix the underlying crash appears to be missing from this pull request. The StateError: Bad state: No element will still be thrown in _closestToAnchorPoint because subScreensInBounds can return an empty list when the widget's size is zero and there are display features.
To resolve this, I recommend adding a guard at the beginning of the DisplayFeatureSubScreen.build method to handle the zero-size case. For instance, if mediaQuery.size is empty, the widget should return its child directly, bypassing the sub-screen calculation logic.
Here's a suggested implementation:
// in packages/flutter/lib/src/widgets/display_feature_sub_screen.dart
@override
Widget build(BuildContext context) {
// ...
final MediaQueryData mediaQuery = MediaQuery.of(context);
final Size parentSize = mediaQuery.size;
if (parentSize.isEmpty) {
return child;
}
// ... rest of the build method
}Once the fix is included, this pull request will be ready for another review. Thank you for adding the test coverage!
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autosubmit label was removed for flutter/flutter/180357, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.
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flutter/flutter@d81cd3e...793b0b8 2026-01-13 [email protected] Make sure that a FormField doesn't crash at 0x0 environment (flutter/flutter#180810) 2026-01-13 [email protected] Roll Fuchsia Linux SDK from VYeyMPe1lyCtlcl-V... to vTYb37OeUqZRxpiiP... (flutter/flutter#180880) 2026-01-13 [email protected] Make sure that a DisplayFeatureSubScreen doesn't crash in 0x0 environ… (flutter/flutter#180357) 2026-01-13 [email protected] Make sure that a DragTarget doesn't crash in 0x0 environment (flutter/flutter#180422) 2026-01-13 [email protected] Manually roll test dependencies (flutter/flutter#180886) 2026-01-12 [email protected] Roll Skia from f70bcbf1b090 to 714d0af2eda7 (2 revisions) (flutter/flutter#180866) 2026-01-12 [email protected] Roll libpng to version 1.6.53 (flutter/flutter#180712) 2026-01-12 [email protected] Turn on fragment shader equality test (flutter/flutter#180784) 2026-01-12 [email protected] Update `PlatformPlugin` to not call `setStatusBarColor`, `setNavigationBarColor`, `setNavigationBarDividerColor` when disabled (flutter/flutter#180061) 2026-01-12 [email protected] Roll Skia from a650ce2b0d50 to f70bcbf1b090 (1 revision) (flutter/flutter#180860) 2026-01-12 [email protected] Fix RawAutocomplete unmounted crash during async optionsBuilder (flutter/flutter#180824) 2026-01-12 [email protected] Fix `documentation member not recognized` because of missing import in `FlutterEngine.java` (flutter/flutter#180731) 2026-01-12 [email protected] Roll Dart SDK from 42fd9ef68c1a to 34318de9874b (1 revision) (flutter/flutter#180854) 2026-01-12 [email protected] Add API sample and docs for Expansible widget (flutter/flutter#180273) 2026-01-12 [email protected] Roll Skia from 487a9943210b to a650ce2b0d50 (2 revisions) (flutter/flutter#180849) 2026-01-12 [email protected] Improve code quality in `BinaryMessenger.java` (flutter/flutter#180733) 2026-01-12 [email protected] Reland `Enabled some disabled impeller fragment shader dart tests` (flutter/flutter#180788) 2026-01-12 [email protected] [ Tool ] Fix `flutter run -d all` crash (flutter/flutter#180845) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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flutter#180357) This is my attempt to handle flutter#6537 for the DisplayFeatureSubScreen widget. Co-authored-by: Tong Mu <[email protected]>
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flutter/flutter@d81cd3e...793b0b8 2026-01-13 [email protected] Make sure that a FormField doesn't crash at 0x0 environment (flutter/flutter#180810) 2026-01-13 [email protected] Roll Fuchsia Linux SDK from VYeyMPe1lyCtlcl-V... to vTYb37OeUqZRxpiiP... (flutter/flutter#180880) 2026-01-13 [email protected] Make sure that a DisplayFeatureSubScreen doesn't crash in 0x0 environ… (flutter/flutter#180357) 2026-01-13 [email protected] Make sure that a DragTarget doesn't crash in 0x0 environment (flutter/flutter#180422) 2026-01-13 [email protected] Manually roll test dependencies (flutter/flutter#180886) 2026-01-12 [email protected] Roll Skia from f70bcbf1b090 to 714d0af2eda7 (2 revisions) (flutter/flutter#180866) 2026-01-12 [email protected] Roll libpng to version 1.6.53 (flutter/flutter#180712) 2026-01-12 [email protected] Turn on fragment shader equality test (flutter/flutter#180784) 2026-01-12 [email protected] Update `PlatformPlugin` to not call `setStatusBarColor`, `setNavigationBarColor`, `setNavigationBarDividerColor` when disabled (flutter/flutter#180061) 2026-01-12 [email protected] Roll Skia from a650ce2b0d50 to f70bcbf1b090 (1 revision) (flutter/flutter#180860) 2026-01-12 [email protected] Fix RawAutocomplete unmounted crash during async optionsBuilder (flutter/flutter#180824) 2026-01-12 [email protected] Fix `documentation member not recognized` because of missing import in `FlutterEngine.java` (flutter/flutter#180731) 2026-01-12 [email protected] Roll Dart SDK from 42fd9ef68c1a to 34318de9874b (1 revision) (flutter/flutter#180854) 2026-01-12 [email protected] Add API sample and docs for Expansible widget (flutter/flutter#180273) 2026-01-12 [email protected] Roll Skia from 487a9943210b to a650ce2b0d50 (2 revisions) (flutter/flutter#180849) 2026-01-12 [email protected] Improve code quality in `BinaryMessenger.java` (flutter/flutter#180733) 2026-01-12 [email protected] Reland `Enabled some disabled impeller fragment shader dart tests` (flutter/flutter#180788) 2026-01-12 [email protected] [ Tool ] Fix `flutter run -d all` crash (flutter/flutter#180845) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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This is my attempt to handle #6537 for the DisplayFeatureSubScreen widget.