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

[James Nguyen]

Eli Zaretskii <eliz@gnu.org> writes:

Working for me, will report back if it comes up again.

>> Date: Wed, 06 Sep 2017 19:55:41 +0300
>> From: Eli Zaretskii <eliz@gnu.org>
>> Cc: 28342@debbugs.gnu.org, jamesn@fastmail.com, charles@aurox.ch,
>>      james@jojojames.com
>> 
>> > (setq scroll-margin 5)
>> > (setq scroll-preserve-screen-position 1)
>> > (setq mouse-wheel-scroll-amount '(1))
>> > 
>> > Open a large file. Make sure you're at the start of the file
>> > 
>> > M-<
>> > 
>> > Scroll down with the mouse wheel and within a few clicks point jumps to 
>> > the middle of the screen. A few more
>> > and it jumps to the end of the file.
>> 
>> Even simpler: after evaluating the first 2 of the above 3 settings,
>> visit xdisp.c, then type this twice:
>> 
>>   C-u 1 C-v
>> 
>> After you type this the second time, Emacs will infloop.
>> 
>> This bug is already present in Emacs 25.1.
>> 
>> I will look into this when I have time.  Thanks for the recipe.
>
> Should be fixed now on the master branch.