Don't bother to try to set focus if we get an EnterNotify for a window we don't know anything about.
Don't bother to try to set focus if we get an EnterNotify for a window
we don't know anything about.

This seems to fix the unclutter(1) problem.

bbidulock/mcwm,tkln/mcwm,bbidulock/mcwm,tkln/mcwm