bug#65187: 29.1; right edge of wide image can not be displayed in image-mode

[Eli Zaretskii]

> From: awrhygty@outlook.com
> Cc: michael_heerdegen@web.de,  65187@debbugs.gnu.org
> Date: Tue, 15 Aug 2023 12:54:57 +0900
> 
> I can not view the right red line with typing many 'C-f's or 'C-e C-f'.

Btw: this I cannot reproduce no matter how hard I try.  Enough C-f's
eventually bring the right red border into view.

Are you sure you cannot see it, no matter how many times you type C-f?
Whazt happens with window-hscroll when you type more and more C-f's?
doesn't it grow all the time?

C-f in this case should run the command image-set-window-hscroll, so
make sure this is what happens in your case.