Re: Set-window-vscroll sometimes doesn't work

[Yuan Fu]

> On Oct 18, 2020, at 10:23 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Sun, 18 Oct 2020 16:06:11 -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.
>> 
>> Cool. I’m thinking about wrapping move_it_by_lines in 
>> window_scroll_pixel_based with a version that regards images (and tall 
>> lines) as several lines. Do you see some potential problems with that?
> 
> What is the problem with the existing code that you are trying to
> solve?  Whatever it is, it is highly likely that the solution already
> exists, and no new code is needed.

The problem I have is that when I scroll over images they jumps in and out of 
the window: (bad-scrolling.mp4)

bad-scrolling.mp4
Description: video/mp4

What I want is to have the images smoothly scrolls in and out: 
(good-scrolling.mp4)

good-scrolling.mp4
Description: video/mp4

Is there already a mean to do that?

Yuan