(mouse-region-delete-keys): New variable.

(mouse-show-mark): If one of those keys is next, delete the region.

1 files changed, 15 insertions, 4 deletions

diff --git a/lisp/mouse.el b/lisp/mouse.el
index c10101bf64b..3a2ad550ead 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -732,6 +732,10 @@ If DIR is positive skip forward; if negative, skip backward."
       nil)))
 
 ;; Momentarily show where the mark is, if highlighting doesn't show it. 
+
+(defvar mouse-region-delete-keys '([delete])
+  "List of keys which shall cause the mouse region to be deleted.")
+
 (defun mouse-show-mark ()
   (if transient-mark-mode
       (if window-system
@@ -739,15 +743,22 @@ If DIR is positive skip forward; if negative, skip backward."
     (if window-system
         (let ((inhibit-quit t)
               (echo-keystrokes 0)
-              event events)
+              event events key)
           (move-overlay mouse-drag-overlay (point) (mark t))
           (while (progn (setq event (read-event))
                         (setq events (append events (list event)))
+                        (setq key (apply 'vector events))
                         (and (memq 'down (event-modifiers event))
-                             (not (key-binding (apply 'vector events)))
+                             (not (key-binding key))
+                             (not (member key mouse-region-delete-keys))
                              (not (mouse-undouble-last-event events)))))
-          (setq unread-command-events
-                (nconc events unread-command-events))
+          ;; For certain special keys, delete the region.
+          (if (member key mouse-region-delete-keys)
+              (delete-region (overlay-start mouse-drag-overlay)
+                             (overlay-end mouse-drag-overlay))
+            ;; Otherwise, unread the key so it gets executed normally.
+            (setq unread-command-events
+                  (nconc events unread-command-events)))
           (setq quit-flag nil)
           (delete-overlay mouse-drag-overlay))
       (save-excursion