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

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

> That's a separate problem, which exists in the current code as well,
> doesn't it?

It doesn't, because s->font isn't updated (while s->face is) in the
current code, which makes everything work properly.

> The only solution to that is to merge the mouse-face with the original
> face, ignoring the attributes of mouse-face that affect the text size,
> as documented in the ELisp manual.

Would this be easy to do?  If so, could you explain where to begin
implementing this?  Thanks.