[xmonad] Issue 40 in xmonad: Screen focus does not follow the mouse pointer

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Comment #12 on issue 40 by hanswc... at gmail.com: Screen focus does not  
follow the mouse pointer
http://code.google.com/p/xmonad/issues/detail?id=40

OK, I believe I've found the problem: I use Plasma Desktop (from KDE) to  
draw my desktop, and it seems like it prevents the virtual root windows  
from detecting that the mouse cursor has entered. Is there any way to  
workaround this?

I can reproduce this with this mostly default xmonad.hs:  
http://mogger.ath.cx/xmonad.hs
(I've only added "manageHook kde4Config" to manageHook, to make Plasma  
Desktop play nicely with xmonad, and of course imported XMonad.Config.Kde.)

Note that Plasma Desktop must be running. If I close it the screen focus  
will work as expected.