[patch] :DiffGitCached supports modifier

[h_east]

Hi Bram and developers,

When we git committing, we can use Vim's standard bundled command 
`:DiffGitCached`. (see :help ft-gitcommit-plugin)

This command is very useful. But we can't specified modifier.
So I wrote a patch to make it possible.

Example: 
:botright DiffGitCached
:belowright DiffGitCached

How about this?

--
Best regards,
Hirohito Higashi (h_east)

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diff --git a/runtime/ftplugin/gitcommit.vim b/runtime/ftplugin/gitcommit.vim
index 6767ff7..e683dcd 100644
--- a/runtime/ftplugin/gitcommit.vim
+++ b/runtime/ftplugin/gitcommit.vim
@@ -24,7 +24,7 @@ if !exists("b:git_dir")
   let b:git_dir = expand("%:p:h")
 endif
 
-command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0,b:git_dir,<f-args>)
+command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<q-mods>,<bang>0,b:git_dir,<f-args>)
 
 let b:undo_ftplugin = b:undo_ftplugin . "|delc DiffGitCached"
 
@@ -42,7 +42,7 @@ function! s:diffcomplete(A,L,P)
   return args
 endfunction
 
-function! s:gitdiffcached(bang,gitdir,...)
+function! s:gitdiffcached(mods,bang,gitdir,...)
   let tree = fnamemodify(a:gitdir,':h')
   let name = tempname()
   let git = "git"
@@ -55,7 +55,7 @@ function! s:gitdiffcached(bang,gitdir,...)
     let extra = "-p --stat=".&columns
   endif
   call system(git." diff --cached --no-color --no-ext-diff ".extra." > ".(exists("*shellescape") ? shellescape(name) : name))
-  exe "pedit ".(exists("*fnameescape") ? fnameescape(name) : name)
+  exe a:mods "pedit ".(exists("*fnameescape") ? fnameescape(name) : name)
   wincmd P
   let b:git_dir = a:gitdir
   command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0,b:git_dir,<f-args>)