(auto-save-mode): Don't let buffer-saved-size stay negative.

diff --git a/lisp/files.el b/lisp/files.el
index 2f886e09dc76909dc43e5ae1e796772d8bbd01d6..f1989dac173a4c523476e9abc4680e5fe9024b21 100644 (file)
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1884,6 +1884,10 @@ With prefix argument ARG, turn auto-saving on if positive, else off."
                      (not buffer-read-only))
                 buffer-file-name
               (make-auto-save-file-name))))
+  ;; If -1 was stored here, to temporarily turn off saving,
+  ;; turn it back on.
+  (and (< buffer-saved-size 0)
+       (setq buffer-saved-size 0))
   (if (interactive-p)
       (message "Auto-save %s (in this buffer)"
               (if buffer-auto-save-file-name "on" "off")))