bug#37335: 27.0.50; screen glitches even with double buffering inhibited

[Eli Zaretskii]

> From: Matt Huszagh <huszaghmatt@gmail.com>
> Date: Sat, 07 Sep 2019 13:44:38 -0700
> 
> This is related to a number of existing bugs (e.g. #26153). Please see
> the attachement for an example of the glitch. Based on the
> recommendations in the other bug reports I've added
> 
> (add-to-list 'default-frame-alist '(inhibit-double-buffering . t))
> 
> to my init file. Interestingly, this helped for about 30min until the
> issue reappeared and then persisted. The glitch typically happens when I
> switch buffers and then move the cursor.

What do you refer to as "glitch" in the attached image?  Is that the
artifact in line 33 after the line number, or is it something else?