(mouse-menu-buffer-maxlen): New variable.

(mouse-buffer-menu): Use it.

1 files changed, 10 insertions, 4 deletions

diff --git a/lisp/mouse.el b/lisp/mouse.el
index f465f19fdd6..72e2cda261b 100644
--- a/lisp/mouse.el
+++ b/lisp/mouse.el
@@ -1152,6 +1152,11 @@ again.  If you do this twice in the same position, it kills the selection."
                             (overlay-start mouse-secondary-overlay)
                             (overlay-end mouse-secondary-overlay)))))))
 
+(defvar mouse-menu-buffer-maxlen 20
+  "*Number of buffers in one pane (submenu) of the buffer menu.
+If we have lots of buffers, divide them into groups of
+`mouse-menu-buffer-maxlen' and make a pane (or submenu) for each one.")
+
 (defun mouse-buffer-menu (event)
   "Pop up a menu of buffers for selection with the mouse.
 This switches buffers in the window that you clicked on,
@@ -1198,15 +1203,16 @@ and selects that window."
          (menu
           ;; If we have lots of buffers, divide them into groups of 20
           ;; and make a pane (or submenu) for each one.
-          (if (> (length buffers) 30)
+          (if (> (length buffers) (/ (* mouse-menu-buffer-maxlen 3) 2))
               (let ((buffers (reverse buffers)) sublists next
                     (i 1))
                 (while buffers
-                  ;; Pull off the next 20 buffers
+                  ;; Pull off the next mouse-menu-buffer-maxlen buffers
                   ;; and make them the next element of sublist.
-                  (setq next (nthcdr 20 buffers))
+                  (setq next (nthcdr mouse-menu-buffer-maxlen buffers))
                   (if next
-                      (setcdr (nthcdr 19 buffers) nil))
+                      (setcdr (nthcdr (1- mouse-menu-buffer-maxlen) buffers)
+                              nil))
                   (setq sublists (cons (cons (format "Buffers %d" i) buffers)
                                        sublists))
                   (setq i (1+ i))