Fix special handling of DEL after dragging a region:

(mouse-drag-region-1): Treat mouse-set-region like mouse-set-point.
(mouse-region-delete-keys): Add [backspace].

1 files changed, 6 insertions, 4 deletions

diff --git a/lisp/mouse.el b/lisp/mouse.el
index 743aba94d5e..0aab1a99bb6 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -961,7 +961,7 @@ at the same position."
           (let* ((fun (key-binding (vector (car event))))
                  (do-multi-click   (and (> (event-click-count event) 0)
                                         (functionp fun)
-                                        (not (eq fun 'mouse-set-point)))))
+                                        (not (memq fun '(mouse-set-point mouse-set-region))))))
             ;; Run the binding of the terminating up-event, if possible.
             (if (and (not (= (overlay-start mouse-drag-overlay)
                              (overlay-end mouse-drag-overlay)))
@@ -1075,7 +1075,7 @@ If DIR is positive skip forward; if negative, skip backward."
              (forward-char 1))))))
 
 (defun mouse-start-end (start end mode)
-"Return a list of region bounds based on START and END according to MODE.
+  "Return a list of region bounds based on START and END according to MODE.
 If MODE is 0 then set point to (min START END), mark to (max START END).
 If MODE is 1 then set point to start of word at (min START END),
 mark to end of word at (max START END).
@@ -1181,8 +1181,10 @@ If MODE is 2 then do the same for lines."
 
 ;; Momentarily show where the mark is, if highlighting doesn't show it.
 
-(defvar mouse-region-delete-keys '([delete] [deletechar])
-  "List of keys which shall cause the mouse region to be deleted.")
+(defcustom mouse-region-delete-keys '([delete] [deletechar] [backspace])
+  "List of keys that should cause the mouse region to be deleted."
+  :group 'mouse
+  :type '(repeat key-sequence))
 
 (defun mouse-show-mark ()
   (let ((inhibit-quit t)