(i) Remove any hard syntax-table properties for <, > inserted by C-y.

(ii) Remove category text props, not syntax-table ones in unmarking <, >.

3 files changed, 25 insertions, 9 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d0cdaf25a23..59bd441f0d8 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,13 @@
+2010-02-25  Alan Mackenzie  <acm@muc.de>
+
+	* progmodes/cc-engine.el (c-clear-<-pair-props)
+	(c-clear->-pair-props): Correct to wipe category text props, not
+	syntax-table ones.
+
+	* progmodes/cc-mode.el (c-after-change): Remove any hard
+	syntax-table properties for <, > which, e.g., C-y has
+	inopportunely converted from category properties.
+
 2010-02-24  Chong Yidong  <cyd@stupidchicken.com>
 
 	* files.el (hack-local-variables-filter): For eval forms, also
diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el
index 3b7f6e4ea0a..336e2c39262 100644
--- a/lisp/progmodes/cc-engine.el
+++ b/lisp/progmodes/cc-engine.el
@@ -4929,8 +4929,8 @@ comment at the start of cc-engine.el for more info."
 	(c-go-list-forward))
       (when (equal (c-get-char-property (1- (point)) 'syntax-table)
 		   c->-as-paren-syntax) ; should always be true.
-	(c-clear-char-property (1- (point)) 'syntax-table))
-      (c-clear-char-property pos 'syntax-table))))
+	(c-clear-char-property (1- (point)) 'category))
+      (c-clear-char-property pos 'category))))
 
 (defun c-clear->-pair-props (&optional pos)
   ;; POS (default point) is at a > character.  If it is marked with
@@ -4946,8 +4946,8 @@ comment at the start of cc-engine.el for more info."
 	(c-go-up-list-backward))
       (when (equal (c-get-char-property (point) 'syntax-table)
 			c-<-as-paren-syntax) ; should always be true.
-	(c-clear-char-property (point) 'syntax-table))
-      (c-clear-char-property pos 'syntax-table))))
+	(c-clear-char-property (point) 'category))
+      (c-clear-char-property pos 'category))))
 
 (defun c-clear-<>-pair-props (&optional pos)
   ;; POS (default point) is at a < or > character.  If it has an
diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index 57f87c04b88..7f9ed6436f4 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -642,11 +642,9 @@ compatible with old code; callers should always specify it."
     (widen)
     (save-excursion
       (if c-get-state-before-change-functions
-	  (let ((beg (point-min))
-		(end (point-max)))
-	    (mapc (lambda (fn)
-		    (funcall fn beg end))
-		  c-get-state-before-change-functions)))
+	  (mapc (lambda (fn)
+		  (funcall fn (point-min) (point-max)))
+		c-get-state-before-change-functions))
       (if c-before-font-lock-function
 	  (funcall c-before-font-lock-function (point-min) (point-max)
 		   (- (point-max) (point-min))))))
@@ -1042,6 +1040,14 @@ Note that the style variables are always made local to the buffer."
 	  (when (> beg end)
 	    (setq beg end)))
 
+	;; C-y is capable of spuriously converting category properties
+	;; c-</>-as-paren-syntax into hard syntax-table properties.  Remove
+	;; these when it happens.
+	(c-clear-char-property-with-value beg end 'syntax-table
+					  c-<-as-paren-syntax)
+	(c-clear-char-property-with-value beg end 'syntax-table
+					  c->-as-paren-syntax)
+
 	(c-trim-found-types beg end old-len) ; maybe we don't need all of these.
 	(c-invalidate-sws-region-after beg end)
 	(c-invalidate-state-cache beg)