L.SubLayouts: also run the layout being modified in a restricted environment
L.SubLayouts: also run the layout being modified in a restricted environment

Ignore-this: 9defa5b6a59ed84a15f733bd979e1c45

This way, correct behavior can be expected if the layout runs ex. 'withWindowset
W.peek', instead of looking at its arguments.

darcs-hash:20090705174156-1499c-66ae6251ba913aab43d873dee209dbdcea973093

kmels/xmonad-launcher,kmels/xmonad-launcher