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

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From: James Nguyen <james <at> jojojames.com>
To: Eli Zaretskii <eliz <at> gnu.org>, athird <at> googlemail.com
Cc: 28342 <at> debbugs.gnu.org, , jamesn <at> fastmail.com, charles <at> aurox.ch
Subject: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
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.

>> Date: Wed, 06 Sep 2017 19:55:41 +0300
>> From: Eli Zaretskii <eliz <at> gnu.org>
>> Cc: 28342 <at> debbugs.gnu.org, jamesn <at> fastmail.com, charles <at> aurox.ch,
>> 	james <at> 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.

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