[xmonad] Issue 363 in xmonad: non-positive argument error on NVidia Xinerama set

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Comment #10 on issue 363 by jesper.reenberg: non-positive argument error on  
NVidia Xinerama set
http://code.google.com/p/xmonad/issues/detail?id=363

It would be better to fix the `new` function, such that it will actually  
allow for more xinerama screens than there are workspaces, if this doesn't  
break any invariants.