https://bugs.kde.org/show_bug.cgi?id=513450

            Bug ID: 513450
           Summary: Alt and Meta modifiers have different keyup behaviors
                    in Window Actions
    Classification: Plasma
           Product: kwin
      Version First unspecified
       Reported In:
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

SUMMARY
The Window Actions mouse modifiers have a discrepancy where releasing the mouse
button before the modifier exhibits different behavior between Meta and Alt. If
using Alt, it will be fired on keyup. If using Meta, it is intercepted on keyup
and doesn't fire. This issue does not occur if Alt is released before the mouse
button.

 The issue is highly visible in Firefox, where pressing Alt unhides the menu
bar. In other applications it will focus the menubar, so for example, in
Okular, after keyup of Alt pressing "F" should open the File menu.

STEPS TO REPRODUCE

1. In System settings > Window management > Window Actions, set the "Inner
Window, Titlebar, and Frame Actions", set the modifier to Alt
2. Start to use any of these modifiers on any application with a menu bar
3. Release the mouse button, then release Alt (Alt is fired and menubar will be
focused)
4. Repeat steps using Meta as modifier to see the interception of Alt's keyup

OBSERVED RESULT
Alt is fired. 

EXPECTED RESULT
Alt should be intercepted.

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1

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