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

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: larsi@gnus.org,  50660@debbugs.gnu.org
> Date: Tue, 21 Sep 2021 20:46:55 +0800
> 
> Thanks, one question though: within this block, w->phys_cursor.vpos is
> 0! How should I go about determining whether or not the cursor is inside
> `row' ATM?

Are you saying the vpos is _always_ zero?  I don't see how this could
be true, because display_and_set_cursor uses that to find the glyph
row that corresponds to the cursor position, and actually draw the
cursor glyph.  If vpos is incorrect, the cursor will appear in the
long place and will look incorrectly.