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* Give Invisible a definition for fail.Spencer Janssen2007-09-291-0/+1
| | | | | | | | The default definition of fail calls error. This is very bad, as we rely on a non-bottom result. We should consider moving to MonadZero, to be on the safe side. darcs-hash:20070929051527-a5988-bef59af98860ac34ef05cc4ff5e1580835367eaa.gz
* Added Invisible to store layout stateAndrea Rossato2007-09-281-0/+42
Invisible is a data type to store information that will be lost when restarting XMonad (the idea came from David Roundy) darcs-hash:20070928190107-32816-ce095723ac5deb5cde50eab871416e3edee1e875.gz