Found what seems to be a bizarre bug today, wasn't even sure what product to place it under. Steps to reproduce 1. Add maori as a keyboard layout 2. Apply changes Now walking though windows (Alt + tab) doesn't work, even if maori isn't the currently active keyboard layout. Removing maori from keyboard layouts list returns functionality. Changing walking windows shortcut (e.g. Meta + tab) also makes it work again. SOFTWARE/OS VERSIONS Kernel Version: 5.5.13-arch2-1 KDE Plasma Version: 5.18.4 KDE Frameworks Version: 5.68.0 Qt Version: 5.14.1
Just reporting the same issue - using Kubuntu SUMMARY After installing the Maori keyboard, Left-Alt-Tab no longer switches between windows. Even if I am not using the Maori keyboard, and if the Maori keyboard is the only keyboard installed, Left-Alt-Tab no longer works. Seems to me that the Left-Alt key stops working. STEPS TO REPRODUCE 1. Install Maori Keyboard 2. 3. OBSERVED RESULT Cannot switch windows with Left-Alt-Tab. Left-Alt seems to not work at all. EXPECTED RESULT left alt work SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.22.5 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION Currently on Kubuntu 21.10. Same problem with 21.04. I have tried reassigning the compose key - but can't find a lot of information about what these various keys are - such as third level shortcut keys and so on. Also - using Xorg. If I use Weyland, the alt tab thing works but the keyboard doesn't, and there are other annoyances with Weyland. Or who is responsible for the layouts. So reporting here.
I guess that should be "Even if I am not using the Maori keyboard, or if the Maori keyboard is the only keyboard installed"
This bug was reported against an outdated version of KWin. We have made many changes since the. If the issue persists in newer versions can you reopen the bug report updating the version number.