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

From: Eli Zaretskii
Subject: bug#28342: 26.0.50; (OSX) Jumpy Scrolling using Trackpad
Date: Wed, 06 Sep 2017 19:55:41 +0300

> From: Alan Third <address@hidden>
> Date: Wed, 6 Sep 2017 09:53:54 +0100
> Cc: address@hidden, "Charles A. Roelli" <address@hidden>,
>       James Nguyen <address@hidden>
> I can replicate on ms windows using just:
> (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.

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