Fix query-replace-regexp incomplete highlighting (Bug#6808).

* replace.el (replace-highlight): Bind isearch-forward and
isearch-error, ensuring that highlighting is updated if the user
switches the search direction (Bug#6808).

* isearch.el (isearch-lazy-highlight-forward): New var.
(isearch-lazy-highlight-new-loop, isearch-lazy-highlight-search):
(isearch-lazy-highlight-update): Use it.

lisp/ChangeLog

@@ -1,3 +1,13 @@
+2010-08-08  Johan Bockgård  <bojohan@gnu.org>
+
+	* replace.el (replace-highlight): Bind isearch-forward and
+	isearch-error, ensuring that highlighting is updated if the user
+	switches the search direction (Bug#6808).
+
+	* isearch.el (isearch-lazy-highlight-forward): New var.
+	(isearch-lazy-highlight-new-loop, isearch-lazy-highlight-search):
+	(isearch-lazy-highlight-update): Use it.
+
 2010-08-06  Kenichi Handa  <handa@m17n.org>
 
 	* international/mule.el (define-charset): Store NAME as :base

lisp/isearch.el

@@ -2574,6 +2574,7 @@ since they have special meaning in a regexp."
 (defvar isearch-lazy-highlight-case-fold-search nil)
 (defvar isearch-lazy-highlight-regexp nil)
 (defvar isearch-lazy-highlight-space-regexp nil)
+(defvar isearch-lazy-highlight-forward nil)
 
 (defun lazy-highlight-cleanup (&optional force)
   "Stop lazy highlighting and remove extra highlighting from current buffer.
@@ -2613,7 +2614,9 @@ by other Emacs features."
                  (not (= (window-start)
                          isearch-lazy-highlight-window-start))
                  (not (= (window-end)   ; Window may have been split/joined.
-                         isearch-lazy-highlight-window-end))))
+			 isearch-lazy-highlight-window-end))
+		 (not (eq isearch-forward
+			  isearch-lazy-highlight-forward))))
     ;; something important did indeed change
     (lazy-highlight-cleanup t) ;kill old loop & remove overlays
     (when (not isearch-error)
@@ -2628,7 +2631,8 @@ by other Emacs features."
 	    isearch-lazy-highlight-case-fold-search isearch-case-fold-search
 	    isearch-lazy-highlight-regexp	isearch-regexp
             isearch-lazy-highlight-wrapped      nil
-	    isearch-lazy-highlight-space-regexp search-whitespace-regexp)
+	    isearch-lazy-highlight-space-regexp search-whitespace-regexp
+	    isearch-lazy-highlight-forward      isearch-forward)
       (unless (equal isearch-string "")
 	(setq isearch-lazy-highlight-timer
 	      (run-with-idle-timer lazy-highlight-initial-delay nil
@@ -2644,7 +2648,8 @@ Attempt to do the search exactly the way the pending Isearch would."
 	    (search-invisible nil)	; don't match invisible text
 	    (retry t)
 	    (success nil)
-	    (bound (if isearch-forward
+	    (isearch-forward isearch-lazy-highlight-forward)
+	    (bound (if isearch-lazy-highlight-forward
 		       (min (or isearch-lazy-highlight-end-limit (point-max))
 			    (if isearch-lazy-highlight-wrapped
 				isearch-lazy-highlight-start
@@ -2678,7 +2683,7 @@ Attempt to do the search exactly the way the pending Isearch would."
 	    (select-window isearch-lazy-highlight-window))
 	(save-excursion
 	  (save-match-data
-	    (goto-char (if isearch-forward
+	    (goto-char (if isearch-lazy-highlight-forward
 			   isearch-lazy-highlight-end
 			 isearch-lazy-highlight-start))
 	    (while looping
@@ -2691,7 +2696,7 @@ Attempt to do the search exactly the way the pending Isearch would."
 		    (let ((mb (match-beginning 0))
 			  (me (match-end 0)))
 		      (if (= mb me)	;zero-length match
-			  (if isearch-forward
+			  (if isearch-lazy-highlight-forward
 			      (if (= mb (if isearch-lazy-highlight-wrapped
 					    isearch-lazy-highlight-start
 					  (window-end)))
@@ -2711,7 +2716,7 @@ Attempt to do the search exactly the way the pending Isearch would."
 			  (overlay-put ov 'priority 1000)
 			  (overlay-put ov 'face lazy-highlight-face)
 			  (overlay-put ov 'window (selected-window))))
-		      (if isearch-forward
+		      (if isearch-lazy-highlight-forward
 			  (setq isearch-lazy-highlight-end (point))
 			(setq isearch-lazy-highlight-start (point)))))
 
@@ -2721,7 +2726,7 @@ Attempt to do the search exactly the way the pending Isearch would."
 			(setq looping nil
 			      nomore  t)
 		      (setq isearch-lazy-highlight-wrapped t)
-		      (if isearch-forward
+		      (if isearch-lazy-highlight-forward
 			  (progn
 			    (setq isearch-lazy-highlight-end (window-start))
 			    (goto-char (max (or isearch-lazy-highlight-start-limit (point-min))

lisp/replace.el

@@ -1893,7 +1893,9 @@ make, or the user didn't cancel the call."
       (let ((isearch-string string)
 	    (isearch-regexp regexp)
 	    (search-whitespace-regexp nil)
-	    (isearch-case-fold-search case-fold))
+	    (isearch-case-fold-search case-fold)
+	    (isearch-forward t)
+	    (isearch-error nil))
 	(isearch-lazy-highlight-new-loop range-beg range-end))))
 
 (defun replace-dehighlight ()