KWin registers/steals the shortcut of the "KDE Keyboard Layout Switcher"
and binds it to a new method which actually switches the layout.

The actual switcher from which the shortcut is stolen should only be a
representation on Wayland. Though how to do this is a problem for the
future. Only the active window is notified about layout changes and the
plasmoid will never get the event in time. This is of course a minor
problem compared to the fact that the KeyboardDaemon is absolutely X11
dependent.