Fix SliverMainAxisGroup SliverEnsureSemantics support #175671
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This pull request correctly extends SliverMainAxisGroup to support SliverEnsureSemantics and respect cacheExtent rules in its visitChildrenForSemantics implementation. The change is logical and aligns with how other viewport-like widgets handle semantics. The included test for SliverEnsureSemantics is good. I've suggested adding another test case to cover the cacheExtent scenario to ensure full test coverage for the changes.
| expect(find.byType(SliverEnsureSemantics, skipOffstage: false), findsNWidgets(2)); | ||
| semantics.dispose(); | ||
| }); | ||
| } |
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This is a great test for SliverEnsureSemantics! The PR also adds support for cacheExtent in visitChildrenForSemantics. It would be good to add another test case to cover that scenario as well, to ensure full test coverage for the change.
For example, a test could verify that a sliver that is not visible but is within the cache extent is correctly included in the semantics tree.
testWidgets('SliverMainAxisGroup includes items in cacheExtent in semantics', (WidgetTester tester) async {
final SemanticsTester semantics = SemanticsTester(tester);
await tester.pumpWidget(
_buildSliverMainAxisGroup(
viewportHeight: 300,
// Default cacheExtent is 250.0
slivers: <Widget>[
const SliverToBoxAdapter(child: SizedBox(height: 300, child: Text('a'))),
const SliverToBoxAdapter(child: SizedBox(height: 100, child: Text('b'))),
],
),
);
// 'b' is not visible, but it should be in the cache extent.
expect(find.text('b'), findsNothing);
// So it should be in the semantics tree.
expect(semantics.nodesWith(label: 'b'), hasLength(1));
semantics.dispose();
});
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| RenderSliver? child = firstChild; | ||
| while (child != null) { | ||
| if (child.geometry!.visible) { | ||
| if (child.geometry!.visible || child.geometry!.cacheExtent > 0.0 || child.ensureSemantics) { |
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Good catch on the cacheExtent I think this should be the correct behavior.
Renzo-Olivares
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Sep 24, 2025
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Renzo-Olivares
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LGTM, thank you for fixing this!
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Roll Flutter from 4a042046a0f1 to b1a28bc065b0 (44 revisions) flutter/flutter@4a04204...b1a28bc 2025-09-25 48625061+muradhossin@users.noreply.github.com web_ui: avoid crash for showPerformanceOverlay; log 'not supported' once (flutter/flutter#173518) 2025-09-25 paulberry@google.com Ignore upcoming `experimental_member_use` warnings. (flutter/flutter#175969) 2025-09-25 engine-flutter-autoroll@skia.org Roll Skia from 753ce2221ce7 to 55436d87e414 (16 revisions) (flutter/flutter#176004) 2025-09-25 tirth@nevercode.io Add google_fonts to team-framework triage guidelines (flutter/flutter#175675) 2025-09-25 bruno.leroux@gmail.com Add tests for InputDecoration borders (M3 and theme normalization) (flutter/flutter#175838) 2025-09-24 737941+loic-sharma@users.noreply.github.com Update Flutter's templates to use dot shorthands (flutter/flutter#175891) 2025-09-24 matt.boetger@gmail.com In Gradle Flutter task, correctly replace '\ ' with ' '. 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(flutter/flutter#175849) 2025-09-24 ahmedsameha1@gmail.com Make sure that a VerticalDivider doesn't crash at 0x0 environment (flutter/flutter#174761) 2025-09-24 ahmedsameha1@gmail.com Make sure that Drawer & DrawerHeader don't crash in 0x0 environment (flutter/flutter#174772) 2025-09-24 rmolivares@renzo-olivares.dev Add an assertion for the relationship between `Visibility.maintainState` and `Visibility.maintainFocusability` (flutter/flutter#175552) 2025-09-24 34465683+rkishan516@users.noreply.github.com fix: remove final class modifier on MenuController (flutter/flutter#174490) 2025-09-24 34465683+rkishan516@users.noreply.github.com fix: cupertino sheet broken example with programatic pop (flutter/flutter#175709) 2025-09-24 mdebbar@google.com [web] Fix assertion thrown when hot restarting during animation (flutter/flutter#175856) 2025-09-24 krca0220@gmail.com Add non uniform TableBorder (flutter/flutter#175773) 2025-09-23 mohellebiabdessalem@gmail.com fix small typo in test docs (flutter/flutter#175776) 2025-09-23 mohellebiabdessalem@gmail.com Use `assertNull` to simplify code (flutter/flutter#175720) If this roll has caused a breakage, revert this CL and stop the roller ...
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To complete the work in PR #166889, this PR ensures that
SliverMainAxisGroupcorrectly supportsSliverEnsureSemanticsand respectscacheExtentrules within itsvisitChildrenForSemanticsimplementation.The fix is adapted from
RenderViewPort.visitChildrenForSemanticscode.Pre-launch Checklist
///).