https://bugs.kde.org/show_bug.cgi?id=420442

            Bug ID: 420442
           Summary: Pressing Alt+Tab with no open windows, while window is
                    loading, makes everything disappear
           Product: kwin
           Version: 5.18.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: core
          Assignee: kwin-bugs-n...@kde.org
          Reporter: nyanpas...@tuta.io
  Target Milestone: ---

SUMMARY
If you press Alt+Tab when no windows are open, and release it after a window
opens, all windows and panels disappear.

STEPS TO REPRODUCE
1. Launch Firefox. For me, it takes about a second before the window appears.
2. Immediately press Alt+Tab and hold Alt. The window switcher will say "Show
Desktop".
3. Once Firefox loads, the window switcher will say "Mozilla Firefox". Release
Alt.

OBSERVED RESULT
Everything but the wallpaper and cursor disappears. If you open another Firefox
window using Ctrl+N, it's also invisible. Windows can be interacted with, using
keyboard or mouse.

EXPECTED RESULT
Windows don't become all invisible.

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20200421
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.1
Kernel Version: 5.6.4-1-default
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6200U CPU @ 2.30GHz
Memory: 7.6 GiB of RAM

ADDITIONAL INFORMATION
I think this occurs in both X11 and Wayland.

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