Sometimes ibus crashes and the alt + space switch language hotkey stops working, and the taskbar ibus language icon (picture here) disappears, yet in the background I'll still notice some ibus-daemon processes are running...
What is the best way to restart ibus without ending your whole desktop session?
So far the best solution I've found is:
pkill ibus-x11
# make sure no ibus-* processes are still running, kill them if they are
/usr/bin/ibus-daemon --daemonize --xim
This seems to be a feasible workaround, but curious if there's a better way to recovered a crashed ibus without logging out and ending your session.
If that still doesn't work, perhaps restarting the plasma session without logging out is your next best step:
https://askubuntu.com/questions/481329/can-i-restart-the-kde-plasma-desktop-without-logging-out