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

[Michael Albinus]

Thierry Volpiatto <thierry.volpiatto@gmail.com> writes:

>> I see why we might want to signal an error to the user when she does
>> (copy-directory "~/test" "~/test/test1"), but I don't see why that
>> implies that we need files-equal-p to handle non-existent files.
> Because if we don't do that, we have to create new directory Test1 and
> then test if Test1 is a subdir of Test.
> This just to avoid that.

This has to be handled in copy-directory. files-equal-p can (will!) be
used also somewhere else.

Best regards, Michael.