https://bugs.kde.org/show_bug.cgi?id=455237

            Bug ID: 455237
           Summary: Windows from another desktop is being rendered on top
                    of current one
           Product: kwin
           Version: 5.25.0
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: kwin-bugs-n...@kde.org
          Reporter: ki...@vladimiroff.org
  Target Milestone: ---

SUMMARY
After upgrading to 5.25.0 (Fedora Rawhide), upon changing a desktop
_particular_ windows from the previous desktop are being rendered on top of
current one. The window is not responding to any interactions whatsoever. Looks
like it's just being rendered there. Re-focusing windows seems to work and the
one actually on current desktop get precedence, but the desktop is never
visible until the ghost one gets minimized or closed.

Saying "particular" because it seems to be happening only with windows of some
apps. Consistently happens with Firefox for instance. It doesn't seem to happen
with Dolphin and Konsole, though. 

A recording might make the issue easier to grasp:
https://drive.proton.me/urls/RTKT32T20C#0sfFTbgP5rKI

STEPS TO REPRODUCE
1. Open some windows on one desktop.
2. Open Firefox on another.
3. Switch to the desktop from step 2 to step 1

OBSERVED RESULT
Firefox is rendered on top of everything, even though once can not interact
with. 

EXPECTED RESULT
Firefox should not be visible given that it's not on the switched to desktop.

SOFTWARE/OS VERSIONS
Linux 5.17.13
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This is a regression after updating to 5.25 on my machine. I've never
experienced an issue anywhere near that on 5.24 and below.

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