Sync with Tramp 2.3.4. Do not merge with master

* doc/misc/trampver.texi:
* lisp/net/trampver.el: Change version to "2.3.4".

* lisp/net/tramp-smb.el (tramp-smb-handle-delete-directory):
Check, that the directory has been removed indeed.

* test/lisp/net/tramp-tests.el (tramp-test21-file-links): Adapt test.
(tramp--test-emacs25-p): New defun.
(tramp-test34-vc-registered): Use it.

doc/misc/trampver.texi

@@ -8,7 +8,7 @@
 @c In the Tramp GIT, the version number is auto-frobbed from
 @c configure.ac, so you should edit that file and run
 @c "autoconf && ./configure" to change the version number.
-@set trampver 2.3.4-pre
+@set trampver 2.3.4
 
 @c Other flags from configuration
 @set instprefix /usr/local

lisp/net/tramp-smb.el

@@ -642,7 +642,12 @@ PRESERVE-UID-GID and PRESERVE-EXTENDED-ATTRIBUTES are completely ignored."
 	  (goto-char (point-min))
 	  (search-forward-regexp tramp-smb-errors nil t)
 	  (tramp-error
-	   v 'file-error "%s `%s'" (match-string 0) directory))))))
+	   v 'file-error "%s `%s'" (match-string 0) directory)))
+
+      ;; "rmdir" does not report an error.  So we check ourselves.
+      (when (file-exists-p directory)
+	(tramp-error
+	 v 'file-error "`%s' not removed." directory)))))
 
 (defun tramp-smb-handle-delete-file (filename &optional _trash)
   "Like `delete-file' for Tramp files."

lisp/net/trampver.el

@@ -7,7 +7,7 @@
 ;; Maintainer: Michael Albinus <michael.albinus@gmx.de>
 ;; Keywords: comm, processes
 ;; Package: tramp
-;; Version: 2.3.4-pre
+;; Version: 2.3.4
 
 ;; This file is part of GNU Emacs.
 
@@ -33,7 +33,7 @@
 ;; should be changed only there.
 
 ;;;###tramp-autoload
-(defconst tramp-version "2.3.4-pre"
+(defconst tramp-version "2.3.4"
   "This version of Tramp.")
 
 ;;;###tramp-autoload
@@ -55,7 +55,7 @@
 ;; Check for Emacs version.
 (let ((x (if (>= emacs-major-version 24)
     "ok"
-  (format "Tramp 2.3.4-pre is not fit for %s"
+  (format "Tramp 2.3.4 is not fit for %s"
 	  (when (string-match "^.*$" (emacs-version))
 	    (match-string 0 (emacs-version)))))))
   (unless (string-match "\\`ok\\'" x) (error "%s" x)))

test/lisp/net/tramp-tests.el

@@ -2771,7 +2771,7 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 
       ;; Check `add-name-to-file'.
       (unwind-protect
-	  (progn
+	  (unless (tramp-smb-file-name-p tramp-test-temporary-file-directory)
 	    (write-region "foo" nil tmp-name1)
 	    (should (file-exists-p tmp-name1))
 	    (add-name-to-file tmp-name1 tmp-name2)
@@ -3802,11 +3802,9 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
 		  (vc-register
 		   (list (car vc-handled-backends)
 			 (list (file-name-nondirectory tmp-name2))))
-		;; `vc-register' has changed its arguments in Emacs 25.1.
-		(error
-		 (vc-register
-		  nil (list (car vc-handled-backends)
-			    (list (file-name-nondirectory tmp-name2))))))
+		;; `vc-register' has changed its arguments in Emacs
+		;; 25.1.  Let's skip it for older Emacsen.
+		(error (skip-unless (tramp--test-emacs25-p))))
 	      ;; vc-git uses an own process sentinel, Tramp's sentinel
 	      ;; for flushing the cache isn't used.
 	      (dired-uncache (concat (file-remote-p default-directory) "/"))
@@ -4053,6 +4051,12 @@ This tests also `make-symbolic-link', `file-truename' and `add-name-to-file'."
     (delete-directory tmp-file)
     (should-not (file-exists-p tmp-file))))
 
+(defun tramp--test-emacs25-p ()
+  "Check for Emacs version >= 25.1.
+Some semantics has been changed for there, w/o new functions or
+variables, so we check the Emacs version directly."
+  (>= emacs-major-version 25))
+
 (defun tramp--test-emacs26-p ()
   "Check for Emacs version >= 26.1.
 Some semantics has been changed for there, w/o new functions or