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@kmels.net, who originally wrote the patch.)