Fix SliverMainAxisGroup.cacheOrigin #175760
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This pull request fixes an issue with SliverMainAxisGroup.cacheOrigin by adopting the same cache calculation logic used in RenderViewport. The changes in sliver_group.dart appear to correctly implement this more robust logic for handling cache origin and extent for child slivers. The new test case in sliver_main_axis_group_test.dart effectively validates this fix. I've added a couple of suggestions to improve floating-point precision handling for consistency within the class.
| constraints.remainingCacheExtent - | ||
| calculateCacheOffset(constraints, from: 0.0, to: scrollOffset), | ||
| ), | ||
| remainingCacheExtent: math.max(0.0, remainingCacheExtent + cacheExtentCorrection), |
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For consistency with other calculations in this file that deal with extents, consider wrapping the remainingCacheExtent calculation with _fixPrecisionError to avoid potential floating-point inaccuracies near zero. This would align it with how overlap and remainingPaintExtent are handled.
remainingCacheExtent: math.max(0.0, _fixPrecisionError(remainingCacheExtent + cacheExtentCorrection)),| maxScrollObstructionExtent += childLayoutGeometry.maxScrollObstructionExtent; | ||
| paintOffset = math.max(childPaintOffset + childLayoutGeometry.paintExtent, paintOffset); | ||
| if (childLayoutGeometry.cacheExtent != 0.0) { | ||
| remainingCacheExtent -= childLayoutGeometry.cacheExtent - cacheExtentCorrection; |
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To prevent potential floating-point precision issues, which can be tricky with extent calculations, consider wrapping this calculation in _fixPrecisionError. This would be consistent with how other extent subtractions are handled in this class.
remainingCacheExtent = _fixPrecisionError(remainingCacheExtent - (childLayoutGeometry.cacheExtent - cacheExtentCorrection));834b687 to
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Hi @Renzo-Olivares, just bumping this PR for your review. Happy to help if anything is unclear. |
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@manu-sncf, thank you for bumping this and I appreciate your patience. I'll take a look this week. |
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Renzo-Olivares
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Oct 20, 2025
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LGTM, thank you for the fix!
chunhtai
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I think this looks fine, just some question
| ); | ||
|
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| final double childScrollOffset = math.max(0.0, constraints.scrollOffset - scrollOffset); | ||
| final double correctedCacheOrigin = math.max(cacheOrigin, -childScrollOffset); |
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is there a case this will be bounded to -childScrollOffset ?
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I don't think so. This case only handles a double-precision issue to prevent childScrollOffset from being less than cacheOrigin.
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Fix flutter#175759 The fix involves using the same logic for cache calculation on RenderViewport. ## Pre-launch Checklist - [X] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [X] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [X] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [X] I signed the [CLA]. - [X] I listed at least one issue that this PR fixes in the description above. - [X] I updated/added relevant documentation (doc comments with `///`). - [X] I added new tests to check the change I am making, or this PR is [test-exempt]. - [X] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [X] All existing and new tests are passing.
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Fix #175759
The fix involves using the same logic for cache calculation on RenderViewport.
Pre-launch Checklist
///).