[xmonad] 2013-02-09 change to XMonad.Prompt.Shell breaks shell completion

[md143rbh7f]

The following change from 2013-02-09 breaks shell completion for me:
    hunk ./XMonad/Prompt/Shell.hs 65
    +    commandToComplete _ c = c

It seems to be passing the entire string into compgen in order to get the
file completions, but it should only pass the last word. I propose
reverting this change. Comments are appreciated.

(CCing c.lopez at kmels.net, who originally wrote the patch.)
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