bug#10489: 24.0.92; dired-do-copy may create infinite directory hierarchy

[Juanma Barranquero]

>  (compare-strings (file-truename (expand-file-name name1 dir)) 0 nil
>                   (file-truename (expand-file-name name2 dir)) 0 nil
>                   read-file-name-completion-ignore-case))

I think we should push for it to be added to Emacs, if only for the
thrill of having a ChangeLog entry

2012-01-13  Michael Albinus <michael.albinus@gmx.de>
            Juanma Barranquero  <lekktu@gmail.com>
            Eli Zaretskii <eliz@gnu.org>

        * files.el (file-name-compare): New function.

i.e., three authors for a three-line function (plus header and comments) ;-)

    Juanma