From: Po Lu <luangruo@yahoo.com>
Date: Fri, 26 Nov 2021 05:21:48 +0000 (+0800)
Subject: Make pixel scrolling through images at the first line smoother
X-Git-Tag: emacs-29.0.90~2852^2~27
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=897a101cd3b7d6b46e3b14e80e3c77373246be6a;p=emacs.git

Make pixel scrolling through images at the first line smoother

* lisp/better-pixel-scroll.el (better-pixel-scroll-scroll-up):
Try to reset vscroll if already vscrolled.
---

diff --git a/lisp/better-pixel-scroll.el b/lisp/better-pixel-scroll.el
index 6101778ac0a..c1469108e05 100644
--- a/lisp/better-pixel-scroll.el
+++ b/lisp/better-pixel-scroll.el
@@ -88,10 +88,11 @@ the height of the current window."
 	      (current-y (+ (cdr (posn-x-y posn))
 		            (cdr (posn-object-width-height posn)))))
     (while (< (- max-y current-y) delta)
-      (when (zerop (vertical-motion -1))
-	(set-window-vscroll nil 0)
-	(signal 'beginning-of-buffer nil))
+      (vertical-motion -1)
       (setq current-y (- current-y (line-pixel-height)))))
+  (let ((current-vscroll (window-vscroll nil t)))
+    (setq delta (- delta current-vscroll))
+    (set-window-vscroll nil 0 t))
   (while (> delta 0)
     (set-window-start nil (save-excursion
                             (goto-char (window-start))