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

[Thierry Volpiatto]

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

>> I have modified files-equal-p and file-subdir-of-p to work with
>> non--existing files,
>
> Calling files-equal-p on non-existing files makes no sense, so I don't
> think we should support it (at least not until we have concrete
> evidence that it is needed, at which point we can decide what we intend
> it to mean).
It is useful to handle e.g
(copy-directory "~/test" "~/test/test1")
where test1 is a non--existing directory.
Actually a check is done once test1 is build and stop the loop, 
so this would avoid creating an unuseful new directory.

We could give an optional arg noexist to files-equal-p.

-- 
  Thierry
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