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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Set-window-vscroll sometimes doesn't work
Date: Sun, 18 Oct 2020 22:19:48 +0300
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In-Reply-To: <4F2C1811-940E-4C58-8EE0-37AA3B666E12@gmail.com> (message from
 Yuan Fu on Sun, 18 Oct 2020 15:12:10 -0400)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 18 Oct 2020 15:12:10 -0400
> Cc: help-gnu-emacs@gnu.org
> 
> 1. Is it true that move_it_by_lines regards an image as one display line?

Yes.  That's why we need vscroll in the first place.

> 2. It seems that when I move focus out of the window, the vscroll setting is nullified, why is that?

I don't know.  It doesn't happen here when I display a tall image and
scroll it with C-n/C-p.