from a text editor hit ctrl+shift+j and a popup appears with "Input Method, completion..."
to remove the shortcut go to KDE/Settings/Input method
- there is a row foreach keyboard
- at the end of the row there is two icons, one for settings and a minus icon
- clic on settings icon and another panel slide in where you can find shortcuts related to "Trigger hint mode" and "Trigger hint mode for one time"