[xmonad] Issue 493 in xmonad: spawnPipe opens another instance of the applicatioon

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Comment #3 on issue 493 by allber... at gmail.com: spawnPipe opens another  
instance of the applicatioon
http://code.google.com/p/xmonad/issues/detail?id=493

The restart-on-mod-q behavior specifically depends on it actually using the  
pipe and being fed data by xmonad; if you don't have a StdinReader  
configured and referenced in the template, xmobar won't care what happens  
on its stdin and won't exit when the pipe from xmonad goes away.  (You may  
want to take this up with xmobar's current maintainer; see  
http://github.com/jaor/xmobar)  Alternately, you could rebind mod-q to  
explicitly kill any running xmobar-s.  (No, this is not supposed to be a  
standard behavior; if xmonad isn't directly feeding it, xmonad should not  
be killing it.)