bug#50564: 28.0.50; Display artifacting in package list

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: 50564@debbugs.gnu.org
> Date: Mon, 13 Sep 2021 20:47:46 +0800
> 
> >   . which parts of the display are left on the screen
> 
> Parts of the names; I've attached three screenshots, of which
> "before.png" depicts the package list before the bug is triggered,
> "bug1.png" depicts the bug, and "correct.png" depicts the screen after
> redraw-display.

That's list-packages, not finder-by-keyword.  I don't see the problem
in the latter, but I do see in the former (and in other displays that
use tabulated-list-mode, for example "C-x C-b").

I will look into this, thanks.