bug#4557: Commit via vc-dir does not restore window configuration

[martin rudalics]

> 1. Split your frame with C-x 3
> 2. M-x vc-dir into a repository. I used a git repository, but I am not sure 
whether this is relevant.
> 3. Commit something
>
> Symptom:
>
> The commit message buffer is shown in the windows besides the
> vc-dir. This is ok. But after finishing the commit with C-c C-c this
> window is closed. IMHO it should stay and show the buffer it has shown
> previously. E.g org-mode does this very good in most circumstances.

I tried to address this issue in revision 106043.  Please have a look.

Thanks, martin