https://bugs.winehq.org/show_bug.cgi?id=50370
--- Comment #6 from Gabriel Ivăncescu gabrielopcode@gmail.com --- Created attachment 69123 --> https://bugs.winehq.org/attachment.cgi?id=69123 Show the window and change its topmost style when changing exclusive cooperative mode.
Does this patch help? According to tests, when changing exclusive cooperative mode, the window becomes visible and topmost (and non-topmost when it is removed, but not hidden).
Note that the tests have todo_wine because the other styles don't match up (this is a known issue, other tests also suffer from it), however the important styles which are WS_VISIBLE and WS_EX_TOPMOST *do* match up with this patch.
If it doesn't fix the regression I'll send it after code freeze, though.