bug#58919: 28.2; dired-copy-file-recursive fails to overwrite directory

[Paul Eggert <eggert@cs.ucla.edu>]

On 12/18/22 11:35, Michael Albinus wrote:
> I re-read your make-directory code, it looks like
> PARENTS isn't propagated any longer to the file name handlers. So this
> must be handled documented there, at least.

Yes, the idea is that in Emacs 29, make-directory handlers never are 
passed a non-nil PARENTS flag, and their return values are always 
ignored. That way, Emacs 28 style make-directory handlers should work 
fine in Emacs 29 since only the intersection of the Emacs 28 and 29 
make-directory APIs is used when calling a make-directory handler.

In Emacs 30, once we've updated make-directory handlers to support the 
Emacs 29 make-directory API, we can simplify the code that calls these 
handlers.