* w32-fns.el (x-selection-owner-p): New function.

* mouse.el (mouse-drag-track): Call deactivate-mark earlier.
(mouse-yank-at-click): If select-active-regions is non-nil,
deactivate the mark before insertion.

* simple.el (deactivate-mark, set-mark): Only save selection if we
own it.

lisp/ChangeLog

@@ -1,3 +1,14 @@
+2009-07-17  David De La Harpe Golden  <david@harpegolden.net>
+
+	* w32-fns.el (x-selection-owner-p): New function.
+
+	* mouse.el (mouse-drag-track): Call deactivate-mark earlier.
+	(mouse-yank-at-click): If select-active-regions is non-nil,
+	deactivate the mark before insertion.
+
+	* simple.el (deactivate-mark, set-mark): Only save selection if we
+	own it.
+
 2009-07-17  Kenichi Handa  <handa@m17n.org>
 
 	* case-table.el (describe-buffer-case-table): Fix for the case

lisp/mouse.el

@@ -927,6 +927,11 @@ will be deleted after return.  DO-MOUSE-DRAG-REGION-POST-PROCESS
 should only be used by mouse-drag-region."
   (mouse-minibuffer-check start-event)
   (setq mouse-selection-click-count-buffer (current-buffer))
+  ;; We must call deactivate-mark before repositioning point.
+  ;; Otherwise, for select-active-regions non-nil, we get the wrong
+  ;; selection if the user drags a region, clicks elsewhere to
+  ;; reposition point, then middle-clicks to paste the selection.
+  (deactivate-mark)
   (let* ((original-window (selected-window))
          ;; We've recorded what we needed from the current buffer and
          ;; window, now let's jump to the place of the event, where things
@@ -971,7 +976,6 @@ should only be used by mouse-drag-region."
     (mouse-move-drag-overlay mouse-drag-overlay start-point start-point
                              click-count)
     (overlay-put mouse-drag-overlay 'window start-window)
-    (deactivate-mark)
     (let (event end end-point last-end-point)
       (track-mouse
 	(while (progn
@@ -1360,10 +1364,16 @@ Also move point to one end of the text thus inserted (normally the end),
 and set mark at the beginning.
 Prefix arguments are interpreted as with \\[yank].
 If `mouse-yank-at-point' is non-nil, insert at point
-regardless of where you click."
+regardless of where you click.
+If `select-active-regions' is non-nil, the mark is deactivated
+before inserting the text."
   (interactive "e\nP")
   ;; Give temporary modes such as isearch a chance to turn off.
   (run-hooks 'mouse-leave-buffer-hook)
+  (when select-active-regions
+    ;; Without this, confusing things happen upon e.g. inserting into
+    ;; the middle of an active region.
+    (deactivate-mark t))
   (or mouse-yank-at-point (mouse-set-point click))
   (setq this-command 'yank)
   (setq mouse-selection-click-count 0)

lisp/simple.el

@@ -3489,6 +3489,7 @@ This function also runs `deactivate-mark-hook'."
     ;; Copy the latest region into the primary selection, if desired.
     (and select-active-regions
 	 mark-active
+	 (x-selection-owner-p 'PRIMARY)
 	 (x-set-selection 'PRIMARY (buffer-substring-no-properties
 				    (region-beginning) (region-end))))
     (if (and (null force)
@@ -3533,8 +3534,12 @@ store it in a Lisp variable.  Example:
       (progn
 	(setq mark-active t)
 	(run-hooks 'activate-mark-hook)
-	(when select-active-regions
-	  (x-set-selection 'PRIMARY (current-buffer)))
+	(and select-active-regions
+	     ;; Only set the selection if we already own PRIMARY.  The
+	     ;; initial selection grab happens in `activate-mark', but
+	     ;; it is necessary to update it here.
+	     (x-selection-owner-p 'PRIMARY)
+	     (x-set-selection 'PRIMARY (current-buffer)))
 	(set-marker (mark-marker) pos (current-buffer)))
     ;; Normally we never clear mark-active except in Transient Mark mode.
     ;; But when we actually clear out the mark value too, we must

lisp/w32-fns.el

@@ -294,12 +294,15 @@ shell requires it (see `w32-shell-dos-semantics')."
 
 ;;; Fix interface to (X-specific) mouse.el
 (defun x-set-selection (type data)
-  (or type (setq type 'PRIMARY))
-  (put 'x-selections type data))
+  (put 'x-selections (or type 'PRIMARY) data))
 
 (defun x-get-selection (&optional type data-type)
-  (or type (setq type 'PRIMARY))
-  (get 'x-selections type))
+  (get 'x-selections (or type 'PRIMARY)))
+
+;; x-selection-owner-p is used in simple.el
+(defun x-selection-owner-p (&optional type)
+  (and (memq type '(nil PRIMARY SECONDARY))
+       (get 'x-selections (or type 'PRIMARY))))
 
 (defun set-w32-system-coding-system (coding-system)
   "Set the coding system used by the Windows system to CODING-SYSTEM.