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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#14324: 24.3;
 GTK scrollbar doesn't scroll proportionally when Line Wrapping is set
 to "Truncate Long Lines"
Date: Mon, 31 May 2021 18:28:43 +0300
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Cc: j.pertres@gmail.com, 14324@debbugs.gnu.org
To: Lars Ingebrigtsen <larsi@gnus.org>
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In-Reply-To: <87sg23jv7l.fsf@gnus.org> (message from Lars Ingebrigtsen on Mon, 
 31 May 2021 08:03:42 +0200)
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> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Mon, 31 May 2021 08:03:42 +0200
> Cc: 14324@debbugs.gnu.org
> 
> j.pertres@gmail.com writes:
> 
> > To reproduce:
> >   1. Visit a buffer with very long lines, and long enough to make Emacs render a
> >   vertical scrollbar
> >   2. In the Options menu, set the option "Line Wrapping" to "Truncate
> >   Long Lines"
> >   3. Drag the scrollbar to navigate the file. Emacs won't scroll
> >   proportionally, but rather get stuck at some points, seemingly at
> >   those very long lines, maybe as if they were still shown in multiple
> >   lines, even though now they don't.
> 
> I can confirm that this problem is still present in Emacs 28.

Which file did you use for testing this?