[Xmonad] darcs patch: Fix bug in noDuplicate invariant

[Robert Marlow]

Fri May 25 15:08:42 JST 2007  Rob <bobstopper at bobturf.org>
  * Fix bug in noDuplicate invariant
  ws used by noDuplicates is actually a list of list of elements which 
  will pretty rarely raise any flags even if the StackSet actually does
  contain duplicates. This patch concatenates ws to ensure the quickcheck
  property tests accurately.
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