bug#51357: 26.3; Recursively copy a directory into a destination where directory already exists no longer works.

[JeppeTh]

In dired-mode when pressing 'C' on a directory to copy it somewhere, it
now only works in case the directory doesn't already exist. Otherwise it fails
with file-already-exists error.
Overwrite mode or not doesn't seem to make any difference.

It seems there's a change in copy-directory where make-directory used to
be called with parents hardcoded to 't'. Now it's not and it thereby
fails.

This used to work in emacs 24.5


In GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
 of 2019-08-29 built on CIRROCUMULUS
Repository revision: 96dd0196c28bc36779584e47fffcca433c9309cd
Windowing system distributor 'Microsoft Corp.', version 10.0.19042
Recent messages:
Loading .emacs_emacs...
Loading .emacs_tags...done
Loading .emacs_emacs...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Error during redisplay: (eval (replace-regexp-in-string "%" "%%" (or (gethash 
(selected-window) which-func-table) which-func-unknown))) signaled 
(wrong-type-argument arrayp nil) [5 times]
Mark set
Error during redisplay: (eval (replace-regexp-in-string "%" "%%" (or (gethash 
(selected-window) which-func-table) which-func-unknown))) signaled 
(wrong-type-argument arrayp nil) [9 times]
Making completion list...
Error during redisplay: (eval (replace-regexp-in-string "%" "%%" (or (gethash 
(selected-window) which-func-table) which-func-unknown))) signaled 
(wrong-type-argument arrayp nil) [2 times]
user-error: Beginning of history; no preceding item

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