(auto-fill-mode): Use force-mode-line-update.

diff --git a/lisp/simple.el b/lisp/simple.el
index 255a9c17d2d6089165d91e4f709c13fca417c22d..27a7233b0cd209147c493b98891ee75f1d94dc4e 100644 (file)
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -2320,8 +2320,7 @@ automatically breaks the line at a previous space."
                       (> (prefix-numeric-value arg) 0))
                   'do-auto-fill
                   nil))
-    ;; update mode-line
-    (set-buffer-modified-p (buffer-modified-p))))
+    (force-mode-line-update)))
 
 ;; This holds a document string used to document auto-fill-mode.
 (defun auto-fill-function ()