[Bug 46916] New: Can' t restore focus to certain minimized fullscreen applications

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46916

            Bug ID: 46916
           Summary: Can't restore focus to certain minimized fullscreen
                    applications
           Product: Wine
           Version: 4.4
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: chrylis at gmail.com
      Distribution: ---

Created attachment 64004
  --> https://bugs.winehq.org/attachment.cgi?id=64004
stderr logs

This is a counterpart to the many (mostly resolved?) bugs regarding switching
*out* of fullscreen applications. On some applications, I can switch out of the
window without any problem. If the application has changed the desktop
resolution, it is restored to the previous setting (e.g.,
1920x1080->3840x2160).

However, I cannot restore focus to the application once it loses focus. The
application will unminimize (from the taskbar or the window switcher), and the
mouse cursor changes to the appropriate graphics, but the application seems
never to be unblurred; it's not redrawn (I believe this is its own choice when
it thinks it doesn't have focus), and the "bookmarked" resolution isn't
applied. The application does not respond to input, and I have to kill Wine
from the CLI.

The applications I have available where I'm able to reproduce the behavior are
based on the Civ4 engine (Civ4 itself, Railroads!). The behavior is identical
regardless of whether the application changes the screen resolution (if it
hasn't, then it'll switch back to full screen and show the last render but is
still frozen). Fallout 2, with or without Restoration, does *not* reproduce the
behavior. It may be linked to D3D.

I'm running KWin 5.14.5 on Intel graphics.

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