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

[Yuan Fu]

> On Oct 23, 2020, at 2:05 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 22 Oct 2020 15:33:40 -0400
>> Cc: help-gnu-emacs@gnu.org
>> 
>>>> With emacs -Q? On my machine emacs -Q doesn’t to that. Instead of moving 
>>>> two line’s height, it just jumps
>>>> to the next logical line.
>>> 
>>> That can only happen if the image fits in the window in its entirety.
>>> Enlarge it so it's taller than the window, and then try again.
>> 
>> In the video I first pressed C-n a couple times, then C-u 2 C-n. It really 
>> doesn’t smooth scroll here (I’m on master).
> 
> Please submit a full bug report, with the image to use, the Lisp code
> to create the buffer you used, and anything else required to reproduce
> the problem.
> 
> FTR, in my testing, I just visited an image file, enlarged it to be
> larger than the window, and then invoked C-n with a numeric argument.
> Your buffer has more stuff, which might make a difference.
> 

In image-mode, C-n is bound to image-next-line, not next-line.

Yuan