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

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: larsi <at> gnus.org, 50660 <at> debbugs.gnu.org
Subject: bug#50660: 28.0.50; Text artifacting when the cursor moves over text under mouse face that originally displayed a box
Date: Mon, 27 Sep 2021 14:52:54 +0300

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: larsi <at> gnus.org,  50660 <at> debbugs.gnu.org
> Date: Sun, 26 Sep 2021 17:56:03 +0800
> 
> > First, which call to display_and_set_cursor are we talking about?
> 
> The call inside show_mouse_face.
> 
> > And what do you mean by "erase_phys_cursor gets very confused" --
> > confused how?
> 
> It calls draw_phys_cursor_glyph, which draws the glyph at the original X
> position, and not the position with the mouse face offset applied.
> 
> What I was asking is whether or not it's okay to not restore
> phys_cursor->x to its original value after the call to
> display_and_set_cursor inside show_mouse_face, or if I should also
> calculate and add the offset in erase_phys_cursor (if
> cursor_in_mouse_face_p) instead.

I think I'm still a bit confused.  Can you show the patch you have
where you see these problems with erase_phys_cursor?

P.S. And sorry for the delay in answering.

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