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

From: James Nguyen <[email-masked]>
Date: Tue, 5 Sep 2017 18:14:11 -0700

The cursor jumps from within the scroll-margins to end of file and back and forth.

Some of those settings can probably be removed but scroll-margin is probably important.

> On Sep 5, 2017, at 1:14 PM, Charles A. Roelli <[email-masked]> wrote:
> 
>> Resent-From: James Nguyen <[email-masked]>
>> Original-Sender: "Debbugs-submit" <[email-masked]>
>> Resent-CC: [email-masked]
>> Resent-Sender: [email-masked]
>> From: James Nguyen <[email-masked]>
>> Date: Sun, 03 Sep 2017 17:22:29 -0700
>> Content-Type: text/plain
>> 
>> 
>> 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.
> 
> What jumps wildly?  Does removing any of these settings stop the issue
> from occurring?