Fixes: debbugs:20257

* lisp/files.el (set-visited-file-name): Clear auto-save if nil.

diff --git a/lisp/files.el b/lisp/files.el
index 0fdf0048ac45553082cf8051d8813f2bbfb4d3c6..eca52e0ddd3e3b5588cb6c41f8af43b0ab2a973b 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3931,17 +3931,19 @@ the old visited file has been renamed to the new name FILENAME."
           (make-local-variable 'backup-inhibited)
           (setq backup-inhibited t)))
     (let ((oauto buffer-auto-save-file-name))
-      ;; If auto-save was not already on, turn it on if appropriate.
-      (if (not buffer-auto-save-file-name)
-         (and buffer-file-name auto-save-default
-              (auto-save-mode t))
-       ;; If auto save is on, start using a new name.
-       ;; We deliberately don't rename or delete the old auto save
-       ;; for the old visited file name.  This is because perhaps
-       ;; the user wants to save the new state and then compare with the
-       ;; previous state from the auto save file.
-       (setq buffer-auto-save-file-name
-             (make-auto-save-file-name)))
+      (cond ((null filename)
+            (setq buffer-auto-save-file-name nil))
+           ((not buffer-auto-save-file-name)
+            ;; If auto-save was not already on, turn it on if appropriate.
+            (and buffer-file-name auto-save-default (auto-save-mode t)))
+           (t
+            ;; If auto save is on, start using a new name. We
+            ;; deliberately don't rename or delete the old auto save
+            ;; for the old visited file name.  This is because
+            ;; perhaps the user wants to save the new state and then
+            ;; compare with the previous state from the auto save
+            ;; file.
+            (setq buffer-auto-save-file-name (make-auto-save-file-name))))
       ;; Rename the old auto save file if any.
       (and oauto buffer-auto-save-file-name
           (file-exists-p oauto)