GNU bug report logs - #28342
26.0.50; (OSX) Jumpy Scrolling using Trackpad

Previous Next

Package: emacs;

Reported by: James Nguyen <james <at> jojojames.com>

Date: Mon, 4 Sep 2017 00:23:02 UTC

Severity: normal

Found in version 26.0.50

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: James Nguyen <james <at> jojojames.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
Date: Sun, 03 Sep 2017 17:22:29 -0700

Recipe:

emacs -Q

(setq scroll-margin 5
      scroll-step 1
      scroll-conservatively 10000
      scroll-preserve-screen-position 1
	  mouse-wheel-scroll-amount '(1)
	  mouse-wheel-progressive-speed nil
	  mouse-wheel-follow-mouse 't)

Open another buffer (init.el for example). Use only one window.
Scroll with trackpad up and down.
Use trackpad mouse to click past the scroll margin.
Try scrolling up and down with trackpad. It will jump wildly.

Video:
https://www.dropbox.com/s/2jwb3p2sul9q36d/JumpyScrolling.m4v?dl=0

Notes: Only seems to happen when there's one window. I could not
reproduce it if I opened a second window (as shown in the video.)

Happens on both Emacs 25 and Emacs 26 (master branch).
This bug report was last modified 7 years and 255 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.