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

From: Po Lu <[email-masked]>
Date: Sat, 16 Oct 2021 08:18:25 +0800

Eli Zaretskii <[email-masked]> writes:

> This part doesn't look right to me: FACE_FOR_CHAR could potentially
> yield a face with a different font, but the glyph codes in the glyph
> string will reference the previous font, because
> get_glyph_face_and_encoding was called before the face was changed.

But now that I think of it, what if the original font has different
metrics than the mouse face?  In that case, shouldn't s->font be the
original font and not the font of the mouse face?  Thanks.

> Also, why did you not follow the more cautious code of xterm.c:
> FACE_FROM_ID can abort if the face is not in the face cache.

Thanks.