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[vector_graphics] Dispose pictures decoded after their VectorGraphic is removed - #13435

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mackings wants to merge 2 commits into
flutter:mainfrom
mackings:vg-dispose-after-unmount
Open

mackings wants to merge 2 commits into
flutter:mainfrom
mackings:vg-dispose-after-unmount

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@mackings

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If a VectorGraphic was removed while its picture was still loading, the picture was never disposed, so it leaked.

The fix caches the picture first, and lets a removed widget release it a moment later. That way, if another widget is waiting on the same load, it can still pick it up, and the picture only gets disposed when nobody is using it.

I didn't use the fix suggested in the issue because it disposes the picture too early when two widgets share a load, and the remaining one ends up drawing a disposed picture. There's a test for that case too.

Fixes flutter/flutter#190185

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@github-actions github-actions Bot added p: vector_graphics triage-engine Should be looked at in engine triage labels Oct 26, 2026

@gemini-code-assist gemini-code-assist Bot left a comment

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Code Review

This pull request updates the vector_graphics package to version 1.2.5, addressing a memory leak that occurs when a VectorGraphic widget is removed before loading finishes. The fix ensures that loaded picture data is cached immediately and that its release is scheduled via a microtask if the widget is unmounted or the loader changes. Unit tests have been added to verify picture disposal behavior across multiple scenarios. As there are no review comments, no further feedback is provided.

@gaaclarke
gaaclarke requested a review from b-luk October 26, 2026 18:23
@b-luk b-luk added the CICD Run CI/CD label Oct 27, 2026
Comment thread packages/vector_graphics/test/caching_test.dart Outdated
Comment thread packages/vector_graphics/lib/src/vector_graphics.dart Outdated
Comment thread packages/vector_graphics/test/caching_test.dart Outdated
@loic-sharma loic-sharma added the triage-framework Should be looked at in framework triage label Oct 27, 2026
@flutter-dashboard flutter-dashboard Bot removed the CICD Run CI/CD label Oct 28, 2026
@b-luk b-luk added the CICD Run CI/CD label Oct 28, 2026

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LGTM. Thanks, @mackings

@b-luk
b-luk requested a review from gaaclarke October 28, 2026 17:51
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[vector_graphics] ui.Picture is not disposed when decoding completes after VectorGraphic is unmounted

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