Add function to disable focusFollowsMouse conditionally
Add function to disable focusFollowsMouse conditionally

Ignore-this: de73003672f76d955fe4476ca279cded

This patch adds an event hook to have the focus follow the mouse only
if a given condition is true.

darcs-hash:20090829212916-7f603-6923680ea9eb60841fc43912cba96fa7f300539a

jthornber/XMonadContrib,jthornber/XMonadContrib