https://bugs.kde.org/show_bug.cgi?id=429545

            Bug ID: 429545
           Summary: Alt-TAB between two windows sometimes focuses another
                    window
           Product: kwin
           Version: 5.20.3
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: san...@outrightsolutions.nl
  Target Milestone: ---

SUMMARY

Alt-tabbing between two windows sometimes moves focus to a third window, making
the alt-tab non-deterministic, impairing workflow.

STEPS TO REPRODUCE

Not exactly sure how to reproduce, it seems probabilistic, it sometimes takes
15-20 times to alt-tab to trigger the bug.

1. have three windows open
2. press alt-tab 15-20 times to switch between two windows, releasing alt key
after  each window switch
3. observe you start switching to the third window after a number of times.

OBSERVED RESULT

alt-tabbing between two windows sometimes starts switching to a third window

EXPECTED RESULT

alt-tabbing between two windows always switches between the two latest windows
that had focus

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION

Reported against versions as specified above, but this bug is happening for at
least half a year already. Using KWin on Xorg.

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