bug#63271: 29.0.90; broken mouse-face

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: luangruo@yahoo.com,  63271@debbugs.gnu.org
> Date: Mon, 08 May 2023 18:56:05 +0300
> 
> >> I think your guess about fonts involved is right
> >> because the problem disappears when the tab-line face
> >> doesn't inherit from the 'variable-pitch' face.
> >
> > How can a face affect mouse-highlight?
> 
> Here is the minimal test case:
> 
>   (insert " " (propertize "TODO"
>                           'face '(:inherit variable-pitch)
>                           'mouse-face 'highlight))
> 
> that causes such effect after moving point over highlighted text
> in fundamental-mode:

Not reproducible here.  I guess it isn't enough to use a face, you
need a specific font for that?

And what exactly is the manifestation of the problem in the image you
posted? that wide black part that hides the letters "ODO"? or
something else?