[xmonad] Issue 242 in xmonad: inter screen handling doesn't work with xrandr --right-of, works with --left-of

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Comment #5 on issue 242 by vogt.a... at gmail.com: inter screen handling  
doesn't work with xrandr --right-of, works with --left-of
http://code.google.com/p/xmonad/issues/detail?id=242

It should work with 0.9.* if you import Data.Monoid(mappend), then change  
<+> to `mappend` like:

shiftDiff f1 f2 ks xconf
           = orderedScreenKeys (onWs f1) (modMask xconf, ks)
           `mappend`
             orderedScreenKeys (onWs f2) (modMask xconf .|. shiftMask, ks)