[PATCH v3 0/1] MR6656: win32u: Avoid leaking window data on thread detach.

[Rémi Bernon]

Should help https://gitlab.winehq.org/wine/wine/-/merge_requests/6649 as well, to avoid leaking parent window either.

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  v3: win32u: Notify the drivers of destroyed windows on thread detach.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6656