[xmonad] Re: Issue 411 in xmonad: Only one desktop spread over displays instead of two separate with Nvidia Twinview

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Comment #10 on issue 411 by vogt.adam: Only one desktop spread over  
displays instead of two separate with Nvidia Twinview
http://code.google.com/p/xmonad/issues/detail?id=411

The xmonad binary can check whether to recompile a config based on the  
relative ages of current config and the library (object or interface or  
xmonad.conf).

But there doesn't seem to be a distro-independent way to get when the  
library was installed.

Perhaps comparison of output from:

ghc-pkg field xmonad id

Multiple installs of xmonad (user, global, various versions) complicate the  
situation, but those tend to be problems in themselves.