Make sure that an AnimatedCrossFade does not crash in 0x0 environment #180088
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This pull request adds a regression test for an issue where AnimatedCrossFade would crash when given a zero size. The test correctly reproduces the scenario. I've suggested an improvement to make the test more robust by also verifying that the cross-fade animation does not crash in this zero-size environment, as the original crash was related to AnimatedSize which is active during the animation.
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| testWidgets('AnimatedCrossFade does not crash at zero area', (WidgetTester tester) async { | ||
| await tester.pumpWidget( | ||
| const Directionality( | ||
| textDirection: TextDirection.ltr, | ||
| child: Center( | ||
| child: SizedBox.shrink( | ||
| child: AnimatedCrossFade( | ||
| firstChild: Text('X'), | ||
| secondChild: Text('Y'), | ||
| crossFadeState: CrossFadeState.showFirst, | ||
| duration: Duration(seconds: 1), | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(AnimatedCrossFade)), Size.zero); | ||
| }); |
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The test is good as it verifies the initial state doesn't crash. However, to make it more robust, it would be beneficial to also test the cross-fade animation itself. The original crash was related to RenderAnimatedSize, which is most active during the animation phase. This ensures that the widget is safe not just in its static states but also during transitions in a zero-size environment.
You could add the following to the test:
await tester.pumpWidget(
const Directionality(
textDirection: TextDirection.ltr,
child: Center(
child: SizedBox.shrink(
child: AnimatedCrossFade(
firstChild: const Text('X'),
secondChild: const Text('Y'),
crossFadeState: CrossFadeState.showSecond,
duration: Duration(seconds: 1),
),
),
),
),
);
await tester.pump(const Duration(milliseconds: 500));
expect(tester.getSize(find.byType(AnimatedCrossFade)), Size.zero);Also, consider making the Text widgets const for minor performance improvement.
victorsanni
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Dec 24, 2025
dkwingsmt
approved these changes
Dec 26, 2025
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Checklist:
- The test is in the correct file
- The test name goes “does not crash at zero area”
- The target widget is wrapped by
Center(or is fullscreen) - The target widget does not have an overlay, or the overlay is tested
- The target widget is expected to have a size of exactly
Size.zero
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Roll Flutter from 6ff7f30 to 60d8165 (32 revisions) flutter/flutter@6ff7f30...60d8165 2025-12-29 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from xn1U9DUFEpB4f6vG-... to DdllqZRZYriOd7Q8v... (flutter/flutter#180356) 2025-12-28 engine-flutter-autoroll@skia.org Roll Dart SDK from 17d51009282c to df175c998021 (1 revision) (flutter/flutter#180349) 2025-12-28 engine-flutter-autoroll@skia.org Roll Dart SDK from d4a92c2c69bf to 17d51009282c (1 revision) (flutter/flutter#180346) 2025-12-28 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from jVkEEUxyGeemuu2HE... to xn1U9DUFEpB4f6vG-... (flutter/flutter#180343) 2025-12-27 engine-flutter-autoroll@skia.org Roll Dart SDK from 3b84125003a1 to d4a92c2c69bf (1 revision) (flutter/flutter#180331) 2025-12-27 engine-flutter-autoroll@skia.org Roll Skia from e6e535aec613 to c29a475066f5 (1 revision) (flutter/flutter#180322) 2025-12-27 ahmedsameha1@gmail.com Make sure that a WidgetsApp doesn't crash in 0x0 environment (flutter/flutter#180224) 2025-12-27 ahmedsameha1@gmail.com Make sure that an AnimatedSize doesn't crash in 0x0 environment (flutter/flutter#180174) 2025-12-27 ahmedsameha1@gmail.com Make sure that an AnimatedGrid doesn't crash in 0x0 environment (flutter/flutter#180159) 2025-12-27 ahmedsameha1@gmail.com Make sure that an AnimatedCrossFade does not crash in 0x0 environment (flutter/flutter#180088) 2025-12-27 ahmedsameha1@gmail.com Make sure that an AnimatedList doesn't crash in 0x0 environment (flutter/flutter#180123) 2025-12-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from mZlbuHta7S71Quawk... to jVkEEUxyGeemuu2HE... (flutter/flutter#180317) 2025-12-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 6b2c3716be54 to 3b84125003a1 (1 revision) (flutter/flutter#180316) 2025-12-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 18f6751c5ccc to 6b2c3716be54 (1 revision) (flutter/flutter#180252) 2025-12-26 engine-flutter-autoroll@skia.org Roll Skia from 07c59737d265 to e6e535aec613 (1 revision) (flutter/flutter#180303) 2025-12-25 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 2q71ydbnIhmBUiNOF... to mZlbuHta7S71Quawk... (flutter/flutter#180290) 2025-12-25 engine-flutter-autoroll@skia.org Roll Skia from 6d0a1b03e9c7 to 07c59737d265 (1 revision) (flutter/flutter#180289) 2025-12-25 engine-flutter-autoroll@skia.org Roll Skia from 2b5d93b62a3f to 6d0a1b03e9c7 (1 revision) (flutter/flutter#180279) 2025-12-25 engine-flutter-autoroll@skia.org Roll Skia from 3544942c9d42 to 2b5d93b62a3f (1 revision) (flutter/flutter#180276) 2025-12-24 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 5EgkVbjGVZmCFPdtR... to 2q71ydbnIhmBUiNOF... (flutter/flutter#180274) 2025-12-24 engine-flutter-autoroll@skia.org Roll Packages from 5e3a766 to 2164da9 (4 revisions) (flutter/flutter#180271) 2025-12-24 engine-flutter-autoroll@skia.org Roll Skia from 988a48f7a944 to 3544942c9d42 (1 revision) (flutter/flutter#180267) 2025-12-24 fluttergithubbot@gmail.com Marks Mac_arm64_mokey native_assets_android to be unflaky (flutter/flutter#180263) 2025-12-24 engine-flutter-autoroll@skia.org Roll Skia from 51a05ce05880 to 988a48f7a944 (1 revision) (flutter/flutter#180256) 2025-12-24 34465683+rkishan516@users.noreply.github.com fix: exclude semantics for disabled dates (flutter/flutter#178981) 2025-12-24 engine-flutter-autoroll@skia.org Roll Skia from 7fe9b93153f8 to 51a05ce05880 (1 revision) (flutter/flutter#180253) 2025-12-24 116356835+AbdeMohlbi@users.noreply.github.com Enhance documentation for sortable column behavior (flutter/flutter#180011) 2025-12-24 engine-flutter-autoroll@skia.org Roll Skia from a0f18947bc1b to 7fe9b93153f8 (4 revisions) (flutter/flutter#180247) 2025-12-23 engine-flutter-autoroll@skia.org Roll Skia from bdb147ae3040 to a0f18947bc1b (2 revisions) (flutter/flutter#180241) 2025-12-23 engine-flutter-autoroll@skia.org Roll Dart SDK from 94b05f717ba3 to 18f6751c5ccc (1 revision) (flutter/flutter#180236) 2025-12-23 kazbek.sultanov.doc@gmail.com docs: clarify dropdown menu text clearing (flutter/flutter#179676) 2025-12-23 flar@google.com New optimized general convex path shadow algorithm (flutter/flutter#178370) 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 stuartmorgan@google.com 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 AnimatedCrossFade widget.