[Xmonad] darcs patch: use safe peek instead of unsafe focus

[Jason Creighton]

Sun Jun 10 19:54:37 MDT 2007  Jason Creighton <jcreigh at gmail.com>
  * use safe peek instead of unsafe focus
  Fixes crashing bug with Xinerama where you have a tabbed layout on one screen
  and attempt to switch to an empty workspace on the other.
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