[xmonad] Issue 478 in xmonad: Restart could be made more robust

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Comment #1 on issue 478 by allber... at gmail.com: Restart could be made more  
robust
http://code.google.com/p/xmonad/issues/detail?id=478

I'm not sure what you're concerned about leaking, as most of the  
information passed on other than the layout detail is available via  
properties in the X server.  Which is where this should be passed anyway;  
I'd probably attach an XMONAD_LAYOUT property to each window with its state  
information.  This also avoids the potential for race conditions when the  
window state changes during the restart sequence.