https://bugs.winehq.org/show_bug.cgi?id=50717
--- Comment #5 from RĂ©mi Bernon rbernon@codeweavers.com --- Created attachment 69709 --> https://bugs.winehq.org/attachment.cgi?id=69709 Possible fix
Is something like that helping in any way?
Instead of creating an override-redirect window, which will bypass the window manager and possibly stay on top of all windows, it uses EWMH desktop window type / below all state to try to hide the dummy parent as much as possible without bypassing the window manager.