[wayland] Add a command-line option to start an input method server
Input-method servers, like maliit, need to be known to KWin since KWin needs to know about virtual keyboards. Virtual keyboards should be shown as OSD layers, and they are one of the types of windows that actually should be showable when the lock screen is active. kwin_wayland --inputmethod /path/to/your/input-server tries to start the input server. The input-server's window never gets keyboard focus and is shown on top of all windows except for KWin's internal clients.
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