Validate itemExtent with geometry in RenderSliverFixedExtentBoxAdaptor#185159
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This pull request adds a debug assertion to RenderSliverFixedExtentBoxAdaptor to verify that the scrollExtent is a multiple of the itemExtent, including tests for the assertion and precision tolerance. Review feedback recommends clarifying the error message by replacing the term "even multiple" with "multiple" and updating the associated test expectations.
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flutter/flutter@31f1802...8e8a194 2026-04-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Fix ImageInfo.isCloneOf to correctly compare scale values (fixes #184626) (#184643)" (flutter/flutter#185203) 2026-04-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Roll Fuchsia Test Scripts from R2EllDf4DgBXVNuiN... to dQ4PjIJB5kZFU8Y32... (#185192)" (flutter/flutter#185199) 2026-04-17 [email protected] [iOS] Migrate FlutterLaunchEngine to Swift (flutter/flutter#185151) 2026-04-17 [email protected] Remove unused `FlutterRunArguments.java` file (flutter/flutter#184160) 2026-04-17 [email protected] Roll Fuchsia Test Scripts from R2EllDf4DgBXVNuiN... to dQ4PjIJB5kZFU8Y32... (flutter/flutter#185192) 2026-04-17 [email protected] [Impeller] Fix morphology filter asymmetric dilation/erosion (flutter/flutter#184913) 2026-04-17 [email protected] `AnimationStyle` methods (flutter/flutter#182333) 2026-04-17 [email protected] Fix _scheduleSystemFontsUpdate assertion during non-idle scheduler phase (flutter/flutter#184332) 2026-04-17 [email protected] Revert "Unpin sdk package dependencies" (flutter/flutter#185186) 2026-04-16 [email protected] Clarify why the `child` is nullable in `AnimatedTransitionBuilder` (flutter/flutter#182995) 2026-04-16 [email protected] Roll Fuchsia Linux SDK from IdBT8fSMYrYSip65j... to di3JdYrdE9OFu8Iyl... (flutter/flutter#185173) 2026-04-16 [email protected] Add dart_skills_lint to dev/tool with test and update readme instructions for new skills authors (flutter/flutter#185033) 2026-04-16 [email protected] [Impeller] Provide std::optional getter for stroke property (flutter/flutter#185112) 2026-04-16 [email protected] Validate itemExtent with geometry in RenderSliverFixedExtentBoxAdaptor (flutter/flutter#185159) 2026-04-16 [email protected] [iOS] Clarify provisioning profile error instructions (flutter/flutter#184051) 2026-04-16 [email protected] [Widget Preview] Fix flaky integration test timeout during flutter clean (flutter/flutter#184991) 2026-04-16 [email protected] Roll Dart SDK from fbddcbe0cd96 to 7c2564c18770 (2 revisions) (flutter/flutter#185143) 2026-04-16 [email protected] Unpin sdk package dependencies (flutter/flutter#184821) 2026-04-16 [email protected] Fix ImageInfo.isCloneOf to correctly compare scale values (fixes #184626) (flutter/flutter#184643) 2026-04-16 [email protected] Roll Skia from 391cdbe3ffe9 to d8415c5d7b91 (2 revisions) (flutter/flutter#185141) 2026-04-16 [email protected] Sync CHANGELOG.md from stable (flutter/flutter#185166) 2026-04-16 [email protected] Revert "Move widget_preview_scaffold into pub workspace" (flutter/flutter#185164) 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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…r#11523) flutter/flutter@31f1802...8e8a194 2026-04-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Fix ImageInfo.isCloneOf to correctly compare scale values (fixes #184626) (#184643)" (flutter/flutter#185203) 2026-04-17 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Roll Fuchsia Test Scripts from R2EllDf4DgBXVNuiN... to dQ4PjIJB5kZFU8Y32... (#185192)" (flutter/flutter#185199) 2026-04-17 [email protected] [iOS] Migrate FlutterLaunchEngine to Swift (flutter/flutter#185151) 2026-04-17 [email protected] Remove unused `FlutterRunArguments.java` file (flutter/flutter#184160) 2026-04-17 [email protected] Roll Fuchsia Test Scripts from R2EllDf4DgBXVNuiN... to dQ4PjIJB5kZFU8Y32... (flutter/flutter#185192) 2026-04-17 [email protected] [Impeller] Fix morphology filter asymmetric dilation/erosion (flutter/flutter#184913) 2026-04-17 [email protected] `AnimationStyle` methods (flutter/flutter#182333) 2026-04-17 [email protected] Fix _scheduleSystemFontsUpdate assertion during non-idle scheduler phase (flutter/flutter#184332) 2026-04-17 [email protected] Revert "Unpin sdk package dependencies" (flutter/flutter#185186) 2026-04-16 [email protected] Clarify why the `child` is nullable in `AnimatedTransitionBuilder` (flutter/flutter#182995) 2026-04-16 [email protected] Roll Fuchsia Linux SDK from IdBT8fSMYrYSip65j... to di3JdYrdE9OFu8Iyl... (flutter/flutter#185173) 2026-04-16 [email protected] Add dart_skills_lint to dev/tool with test and update readme instructions for new skills authors (flutter/flutter#185033) 2026-04-16 [email protected] [Impeller] Provide std::optional getter for stroke property (flutter/flutter#185112) 2026-04-16 [email protected] Validate itemExtent with geometry in RenderSliverFixedExtentBoxAdaptor (flutter/flutter#185159) 2026-04-16 [email protected] [iOS] Clarify provisioning profile error instructions (flutter/flutter#184051) 2026-04-16 [email protected] [Widget Preview] Fix flaky integration test timeout during flutter clean (flutter/flutter#184991) 2026-04-16 [email protected] Roll Dart SDK from fbddcbe0cd96 to 7c2564c18770 (2 revisions) (flutter/flutter#185143) 2026-04-16 [email protected] Unpin sdk package dependencies (flutter/flutter#184821) 2026-04-16 [email protected] Fix ImageInfo.isCloneOf to correctly compare scale values (fixes #184626) (flutter/flutter#184643) 2026-04-16 [email protected] Roll Skia from 391cdbe3ffe9 to d8415c5d7b91 (2 revisions) (flutter/flutter#185141) 2026-04-16 [email protected] Sync CHANGELOG.md from stable (flutter/flutter#185166) 2026-04-16 [email protected] Revert "Move widget_preview_scaffold into pub workspace" (flutter/flutter#185164) 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 PR implements a validation assertion for RenderSliverFixedExtentBoxAdaptor (the modern successor to the RenderBlockViewport mentioned in the original issue) to ensure that the total scroll extent is consistent with the fixed item extent.
When a sliver has a fixed itemExtent, the total scrollExtent should always be an even multiple of that extent. If a custom implementation of computeMaxScrollOffset (or manual geometry manipulation in a subclass) returns a value that isn't a multiple, it can lead to unexpected layout behavior or rounding issues in scroll offsets.
This change adds a debugAssertDoesMeetConstraints override to RenderSliverFixedExtentBoxAdaptor that verifies:
precisionErrorTolerance.
Fixes #2121
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