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v10: user32: Pass real argument to NtUserGetClassName in RealGetWindowClass{A/W}.
win32u: Add support for retrieving real window class ID across processes.
user32: Set real window class ID for user32 static controls.
https://gitlab.winehq.org/wine/wine/-/merge_requests/4092
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54037
test_SendMessage_other_thread(2), which is supposed to show that
Windows doesn't use an internal sent message for SetParent, tacks
this onto another more complex test, which introduces a race
condition (see Comment 2 on the bug). I am not sure if it can be
fixed in the existing function, perhaps it can and I just can't
keep track of all the moving parts well enough, but I see no need
to make it so difficult.
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https://gitlab.winehq.org/wine/wine/-/merge_requests/4493