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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#16840: 24.3.50;
 Jerky motion and up/down asymmetry scrolling images in Eww
Date: Thu, 26 Sep 2019 21:32:28 +0300
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To: Lars Ingebrigtsen <larsi@gnus.org>
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In-reply-to: <8736gjkk9i.fsf@gnus.org> (message from Lars Ingebrigtsen on Thu, 
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> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: nljlistbox2@gmail.com,  16840@debbugs.gnu.org
> Date: Thu, 26 Sep 2019 20:03:21 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > But after that, I see no issues with scrolling, none at all.
> 
> I get (when hitting `down' from the start of the buffer) that I advance
> line by line until I hit the image, and then I suddenly get a big jump,
> and about half the window displays the top of the image.
> 
> Then hitting `down' some more, it advances line by line.
> 
> Then when we get to the end of the image, I get "0 1" at the bottom of
> the frame, and then I hit `down' once more, and then nothing of the
> image is displayed.

This is all as expected, so there's no bug here.