Re: [PATCH v28 0/1] MR9442: comctl32/treeview: check for child item before SendExpanding

[Zhiyi Zhang (＠zhiyi)]

On Tue Mar  3 10:12:36 2026 +0000, Thomas Csovcsity wrote:
> I had a deeper look at the app behavior and tried to write a small app
> reproducing it without success.
> Following code flow and app behavior triggers the error, but i am not
> sure which additional conditions are necessary to reproduce this.
> - the app is actively deleting child items from node, after receiving TVN_ITEMEXPANDINGW
> - without changing `item->state |= TVIS_EXPANDED;` the next mouse click
> triggers a toggle, but this code still assumes that the node is
> expanded, therefore it takes the wrong branch.
> If i follow the rules
> https://gitlab.winehq.org/wine/wine/-/wikis/Clean-Room-Guidelines, i am
> stuck here to write a small app to reproduce the bug or to write a test
> for this case.
> Any hint is appreciated or please close this MR otherwise with a note.
> I would suggest writing a test that takes the code to execute on the wrong path, thus reproducing the bug.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/9442#note_131083