bug#28451: 26.0.50; copy-directory no longer creates parent directories of target if they do not exist

[Paul Eggert]

Andrew Christianson wrote:
> -            (make-directory newname t)))
> +            (make-directory newname t))
> +            ((and copy-contents (not (file-directory-p newname)))
> +             (make-directory newname parents)))

Thanks for clarifying the test case and for the proposed patch. I reproduced the 
bug on Fedora 26 and wrote a test case to test case for the bug. Although the 
abovementioned patch should work on Fedora, it won't work on platforms that do 
not allow trailing / on mkdir arguments. So I installed the attached patch into 
the emacs-26 branch, and am boldly marking this bug as fixed. Please give it a try.

0001-Fix-recently-introduced-copy-directory-bug.patch
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