* lisp/progmodes/cc-engine.el (c-forward-sws, c-backward-sws):

Avoid spuriously marking the buffer as modified because of c-is-sws.

2 files changed, 7 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2516d775243..04cf8291dff 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,8 @@
 2012-07-17  Stefan Monnier  <monnier@iro.umontreal.ca>
 
+        * progmodes/cc-engine.el (c-forward-sws, c-backward-sws):
+        Avoid spuriously marking the buffer as modified because of c-is-sws.
+
         * progmodes/sh-script.el (sh-syntax-propertize-function): Mark "${#VAR"
         as not-a-comment (bug#11946).
 
diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el
index 82aee7bdbb9..142ec4cdd66 100644
--- a/lisp/progmodes/cc-engine.el
+++ b/lisp/progmodes/cc-engine.el
@@ -1688,6 +1688,7 @@ comment at the start of cc-engine.el for more info."
         ;; high as possible.
         (setq rung-pos (point)))
 
+      (with-silent-modifications
       (while
           (progn
             (while
@@ -1843,7 +1844,7 @@ comment at the start of cc-engine.el for more info."
                 (1- last-put-in-sws-pos))
                (c-remove-is-and-in-sws (1- last-put-in-sws-pos)
                                        last-put-in-sws-pos))))
-      )))
+      ))))
 
 (defun c-backward-sws ()
   ;; Used by `c-backward-syntactic-ws' to implement the unbounded search.
@@ -1881,6 +1882,7 @@ comment at the start of cc-engine.el for more info."
           (goto-char (setq rung-pos rung-is-marked))
         (goto-char simple-ws-beg))
 
+      (with-silent-modifications
       (while
           (progn
             (while
@@ -2066,7 +2068,7 @@ comment at the start of cc-engine.el for more info."
                 last-put-in-sws-pos)
                (c-remove-is-and-in-sws last-put-in-sws-pos
                                        (1+ last-put-in-sws-pos)))))
-      )))
+      ))))
 
 
 ;; Other whitespace tools