Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I think we can install the file-subdir-of-p test now and leave the rest
> for 24.2.  Can you (re)send the corresponding patch?  Note that
> (or (files-equal-p directory newname)
>     (file-subdir-of-p newname directory))
> should be replaced by just (file-subdir-of-p newname directory), because
> this primitive should be a "⊆" rather than "⊂".

I have removed one more occurence of `files-equal-p' no more needed in
dired-aux.el.
So this function is not needed actually; I have not removed it though.
Maybe I should and add it only after 24.1?