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

[Stefan Monnier]

>>> Likely, there won't be different handlers. It's always
>>> `tramp-file-name-handler', which calls the respective sub-handlers.
>> ??? Are we to assume that a file-handler is always the Tramp handler?
>> What about others, like jka-compr?
> I stay corrected, there's also `url-file-handler'.

I'm sure there are others.
I seem to remember bumping into a package recently which implemented yet
another file-name-handler of the same general kind.


        Stefan