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[win32] Fix PopupWindowControllerWin32 message handling - #193233

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auto-submit[bot] merged 2 commits into
flutter:masterfrom
knopp:win32_popup_messages
Sep 23, 2026
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auto-submit[bot] merged 2 commits into
flutter:masterfrom
knopp:win32_popup_messages

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@knopp

@knopp knopp commented Sep 23, 2026

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  • Fixes the popup window handling unrelated WM_DESTROY message (missing viewId check)
  • Removes automatic closing of popup when parent size changed

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@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Sep 23, 2026
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging.

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

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@github-actions github-actions Bot added the framework flutter/packages/flutter repository. See also f: labels. label Sep 23, 2026

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Code Review

This pull request removes the handling of the _WM_SIZE message and moves the _WM_DESTROY message handling block within PopupWindowControllerWin32.handleMessage. The review feedback points out a critical regression: moving the _WM_DESTROY block below the _destroyed check prevents the engine's destroy message from being processed when the window is already marked as destroyed, which causes resource leaks. It is recommended to keep the _WM_DESTROY handling at the top of the method while adding a view ID check, and to remove the duplicate block at the end of the method.

@knopp
knopp requested a review from mattkae September 23, 2026 17:50

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That sounds more right to me!

@mattkae mattkae added the autosubmit Merge PR when tree becomes green via auto submit App label Sep 23, 2026
@auto-submit auto-submit Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Sep 23, 2026
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auto-submit Bot commented Sep 23, 2026

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autosubmit label was removed for flutter/flutter/193233, because - The status or check suite ci.yaml validation has failed. Please fix the issues identified (or deflake) before re-applying this label.

@knopp
knopp force-pushed the win32_popup_messages branch from f5bd7ca to 12bbcbc Compare September 23, 2026 18:30
@mattkae mattkae added the autosubmit Merge PR when tree becomes green via auto submit App label Sep 23, 2026
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auto-submit Bot added this pull request to the merge queue Sep 23, 2026
Merged via the queue into flutter:master with commit a175c56 Sep 23, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Sep 23, 2026
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