Subject: bug#28342: closed (Re: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad)

From: [email-masked] (GNU bug Tracking System)
Date: Sun, 10 Sep 2017 02:42:03 +0000

Your bug report

#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
28342: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=28342
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
From: Eli Zaretskii <[email-masked]>
To: James Nguyen <[email-masked]>
Cc: [email-masked], [email-masked], [email-masked], [email-masked]
Date: Sun, 10 Sep 2017 05:40:56 +0300
List-Id: <debbugs-submit.debbugs.gnu.org>

> From: James Nguyen <[email-masked]>
> Cc: [email-masked], [email-masked], [email-masked]
> Date: Sat, 09 Sep 2017 18:14:56 -0700
> 
> Eli Zaretskii <[email-masked]> writes:
> 
> Working for me, will report back if it comes up again.

Thanks, closing.

Subject: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
From: James Nguyen <[email-masked]>
To: [email-masked]
Date: Sun, 03 Sep 2017 17:22:29 -0700
List-Id: <debbugs-submit.debbugs.gnu.org>

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).