When want to make command line completion, we use -complete=customlist,XXX. But 
it can't work with candidates contain spaces. For example, it can't treat 
'C:\Program Files'.

function! CompleteFunc(A, L, P)
  echomsg string([a:A, a:L, a:P])
  return map(split(glob(a:A . '*'), "\n"), 'fnameescape(v:val)')
endfunction
command! -nargs=* -complete=customlist,CompleteFunc Test :

Below is a patch.

https://gist.github.com/3089589

Please check.

However, I wonder why ExpandEscape() choose kind of context to escape.

        if (xp->xp_context == EXPAND_FILES
                || xp->xp_context == EXPAND_FILES_IN_PATH
                || xp->xp_context == EXPAND_SHELLCMD
                || xp->xp_context == EXPAND_BUFFERS
                || xp->xp_context == EXPAND_DIRECTORIES)

Currently, vim script like above should escape candidates. But I'm thinking 
escaping should work always for command line completion.

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