bug#50660: 28.0.50; Text artifacting when the cursor moves over text under mouse face that originally displayed a box

[Eli Zaretskii]

> Cc: 50660@debbugs.gnu.org
> Date: Sun, 19 Sep 2021 08:33:37 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > Note the little dots above to the right of the Zs.  I don't think those
> > should be there, so there might be a off-by-one error (or something)
> > when computing something here...
> 
> That is probably the same bug, though in a different form.  Thanks.

Feel free to dig in the display code involved in this, I don't intend
doing that any time soon.

TIA