master 6e865a7: Further reduce image-related stutter during precision scrolling

[Po Lu]

branch: master
commit 6e865a7171d80cd91b54c6d71b88d960b920abe3
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Further reduce image-related stutter during precision scrolling
    
    * lisp/pixel-scroll.el
    (pixel-scroll-precision-scroll-down-page): Disable
    `scroll-preserve-screen-position' and `auto-window-vscroll'
    while scrolling.
---
 lisp/pixel-scroll.el | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lisp/pixel-scroll.el b/lisp/pixel-scroll.el
index 5425462..336b555 100644
--- a/lisp/pixel-scroll.el
+++ b/lisp/pixel-scroll.el
@@ -453,7 +453,9 @@ the height of the current window."
                      (goto-char desired-start)
                      (when (zerop (vertical-motion (1+ scroll-margin)))
                        (signal 'end-of-buffer nil))
-                     (point))))
+                     (point)))
+         (scroll-preserve-screen-position nil)
+         (auto-window-vscroll nil))
     (when (and (or (< (point) next-pos))
                (let ((pos-visibility (pos-visible-in-window-p next-pos nil t)))
                  (and pos-visibility