Fix xinerama workspace swapping with A.CopyWindow.killAllOtherCopies
Fix xinerama workspace swapping with A.CopyWindow.killAllOtherCopies

Spotted by arlinius in #xmonad, and this only shows up for xinerama setups.
Using an algorithm that scales better with number of workspaces would probably
be shorter too (visiting them in turn, rather than doing random access), but
probably not worth the effort.


reenberg/XMonadContrib,reenberg/XMonadContrib