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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#28342: closed (26.0.50; (OSX) Jumpy Scrolling using Trackpad)
Date: Sun, 10 Sep 2017 02:42:03 +0000

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Your message dated Sun, 10 Sep 2017 05:40:56 +0300
with message-id <83h8wbuvgn.fsf <at> gnu.org>
and subject line Re: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
has caused the debbugs.gnu.org bug report #28342,
regarding 26.0.50; (OSX) Jumpy Scrolling using Trackpad
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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28342: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28342
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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).

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From: Eli Zaretskii <eliz <at> gnu.org>
To: James Nguyen <james <at> jojojames.com>
Cc: athird <at> googlemail.com, 28342-done <at> debbugs.gnu.org, jamesn <at> fastmail.com,
 charles <at> aurox.ch
Subject: Re: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
Date: Sun, 10 Sep 2017 05:40:56 +0300

> From: James Nguyen <james <at> jojojames.com>
> Cc: 28342 <at> debbugs.gnu.org, jamesn <at> fastmail.com, charles <at> aurox.ch
> Date: Sat, 09 Sep 2017 18:14:56 -0700
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> Working for me, will report back if it comes up again.

Thanks, closing.

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