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