(rmail-summary-get-new-mail): Don't call rmail-summary-goto-msg if msg is 0.

[gnu-emacs] / lisp / scroll-bar.el

diff --git a/lisp/scroll-bar.el b/lisp/scroll-bar.el
index 181e02999e7d36e80ad7e039a6e20179c933cc3c..ca7d14532ee52e12b48a9939bd87cafb43c13c8e 100644 (file)
--- a/lisp/scroll-bar.el
+++ b/lisp/scroll-bar.el
@@ -1,6 +1,6 @@
 ;;; scroll-bar.el --- window system-independent scroll bar support.
 
-;;; Copyright (C) 1993 Free Software Foundation, Inc.
+;;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
 
 ;; Maintainer: FSF
 ;; Keywords: hardware
@@ -132,18 +132,24 @@ EVENT should be a scroll bar click or drag event."
   "Scroll the window by dragging the scroll bar slider.
 If you click outside the slider, the window scrolls to bring the slider there."
   (interactive "e")
-  (let* (done)
-    (scroll-bar-drag-1 event)
-    (track-mouse
-      (while (not done)
-       (setq event (read-event))
-       (if (eq (car-safe event) 'mouse-movement)
-           (setq event (read-event)))
-       (cond ((eq (car-safe event) 'scroll-bar-movement)
-              (scroll-bar-drag-1 event))
-             (t
-              ;; Exit when we get the drag event; ignore that event.
-              (setq done t)))))))
+  (let* (done
+        (echo-keystrokes 0))
+    (or point-before-scroll
+       (setq point-before-scroll (point)))
+    ;; Our scrolling can move point; don't let that clear point-before-scroll.
+    (let (point-before-scroll)
+      (scroll-bar-drag-1 event)
+      (track-mouse
+       (while (not done)
+         (setq event (read-event))
+         (if (eq (car-safe event) 'mouse-movement)
+             (setq event (read-event)))
+         (cond ((eq (car-safe event) 'scroll-bar-movement)
+                (scroll-bar-drag-1 event))
+               (t
+                ;; Exit when we get the drag event; ignore that event.
+                (setq done t)))))
+      (sit-for 0))))
 
 (defun scroll-bar-scroll-down (event)
   "Scroll the window's top line down to the location of the scroll bar click.
@@ -155,9 +161,13 @@ EVENT should be a scroll bar click."
          (let* ((end-position (event-end event))
                 (window (nth 0 end-position))
                 (portion-whole (nth 2 end-position)))
-           (select-window window)
-           (scroll-down
-            (scroll-bar-scale portion-whole (1- (window-height))))))
+           (let (point-before-scroll)
+             (select-window window))
+           (or point-before-scroll
+               (setq point-before-scroll (point)))
+           (let (point-before-scroll)
+             (scroll-down
+              (scroll-bar-scale portion-whole (1- (window-height)))))))
       (select-window old-selected-window))))
 
 (defun scroll-bar-scroll-up (event)
@@ -170,9 +180,13 @@ EVENT should be a scroll bar click."
          (let* ((end-position (event-end event))
                 (window (nth 0 end-position))
                 (portion-whole (nth 2 end-position)))
-           (select-window window)
-           (scroll-up
-            (scroll-bar-scale portion-whole (1- (window-height))))))
+           (let (point-before-scroll)
+             (select-window window))
+           (or point-before-scroll
+               (setq point-before-scroll (point)))
+           (let (point-before-scroll)
+             (scroll-up
+              (scroll-bar-scale portion-whole (1- (window-height)))))))
       (select-window old-selected-window))))
 
 \f