plasmashell stuck at 100% CPU
My fedora 35 had its plasmashell process stuck at 100% CPU, after some switching between wayland and X11 sessions. When trying to change global keyboard shortcuts (e.g. Alt-F1 for the App-Menu Launcher), it would freeze completely for like 30 seconds, repeatedly.
A new user wouldn't have that problem.
The fix was to remove ~/.config/plasmashellrc.