Subject: bug#37784: Buffer messed up when scrolling undecorated frame

From: Eli Zaretskii <[email-masked]>
Date: Thu, 17 Oct 2019 10:51:43 +0300

> From: Carlos Pita <[email-masked]>
> Date: Wed, 16 Oct 2019 22:50:47 -0300
> 
> Very easily reproducible in emacs-26.2 tag also, but not in master
> branch. Do you know what commit could have fixed this? I would like to
> backport the change to emacs-26.

Please don't do any development of new features on Emacs 26, it will
save you from bumping into bugs that are long solved.