[xmonad] Issue 19 in xmonad: Investigate a way to allow contrib extensions to use compositing.

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Comment #16 on issue 19 by daniel.schoepe: Investigate a way to allow  
contrib extensions to use compositing.
http://code.google.com/p/xmonad/issues/detail?id=19

The advantage of handleEventHook is that you also receive events that would  
otherwise
be handled by xmonad. Layouts only receive unhandled events. State could be  
done by
using an IORef.
I also submitted a patch a while ago that adds arbitrary other state to  
XState that
can be used by extension, to avoid this abuse of the layoutHook, which  
might be
suitable for this.

I don't know what you mean by actions not having a way to receive Events:  
If you mean
something like a callback on a specific event that can be done with  
handleEventHook
or a layout modifier(by passing around an IORef these actions can also  
maintain state
between calls).

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