[Xmonad] darcs patch: Combo.hs: use case instead of non-standard pattern mat...

Wed Jun 20 13:28:05 CEST 2007 joachim.fasting@gmail.com * Combo.hs: use case instead of non-standard pattern matching. Also uses fmap/maybe instead of do/case, which makes the code look a little cleaner (imo). Please note that I've only been able to test this briefly, but it seems to be working like it's supposed to.