Make copy-directory act like copy-file etc.

Do the special dance with the destination only if it is a
directory name, for consistency with copy-file etc. (Bug#27986).
* doc/emacs/files.texi (Copying and Naming):
* doc/lispref/files.texi (Create/Delete Dirs):
* etc/NEWS: Document this.
* lisp/files.el (copy-directory): Treat NEWNAME as special
only if it is a directory name.

1 files changed, 3 insertions, 2 deletions

diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index eacaf046370..901382fe9bd 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -2976,8 +2976,9 @@ if they don't already exist.
 
 @deffn Command copy-directory dirname newname &optional keep-time parents copy-contents
 This command copies the directory named @var{dirname} to
-@var{newname}.  If @var{newname} names an existing directory,
+@var{newname}.  If @var{newname} is a directory name,
 @var{dirname} will be copied to a subdirectory there.
+@xref{Directory Names}.
 
 It always sets the file modes of the copied files to match the
 corresponding original file.
@@ -2992,7 +2993,7 @@ this happens by default.
 
 The fifth argument @var{copy-contents}, if non-@code{nil}, means to
 copy the contents of @var{dirname} directly into @var{newname} if the
-latter is an existing directory, instead of copying @var{dirname} into
+latter is a directory name, instead of copying @var{dirname} into
 it as a subdirectory.
 @end deffn