[xmonad] darcs patch: X.H.UrgencyHook: performance fix

27 Mar 2010

      Sat Mar 27 21:15:03 CET 2010  Tomas Janousek 
  * X.H.UrgencyHook: performance fix

  cleanupUrgents would update the Map in extensible state 2-times the number of
  visible windows, resulting in excessive memory usage and garbage collection.
  This seems to make it behave correctly.

Note: this is actually not necessary after the fix to core I just posted, but
it should speed things up a little if one has hundreds of visible windows.
-- 
Tomáš Janoušek, a.k.a. Liskni_si, http://work.lisk.in/