bug#6183: 23.1; Committing in version control mode (via C-x vv) with two open windows closes one.

[martin rudalics]

> I often work with two windows.
>
> When I now commit in Mercurial via "C-x vv", the commit message window
> replaces the "other" windows buffer.
>
> After hitting "C-c C-c" to finish the commit message, the window closes.
>
> I would expect it to return to the previous buffer instead.

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

Thanks, martin