bug#64440: 30.0.50; [PATCH] Highlight on non toolkit menu bar items

[Eli Zaretskii]

> Cc: 64440@debbugs.gnu.org, Manuel Giraud <manuel@ledu-giraud.fr>
> Date: Sat, 02 Sep 2023 08:44:16 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Stefan Kangas <stefankangas@gmail.com> writes:
> 
> >> Here is a new set of patches with two more on top of the previous ones
> >> (ie. Number 1 and 2 should be the same as before).
> >>
> >> Number 3 sets the default mouse cursor to be an arrow on the default
> >> menu bar area.  Number 4 fixes a flickering I had while moving the mouse
> >> pointer *into* a menu bar entry.
> >
> > Po Lu, do you have any comments on this patch series?
> >
> > Thanks in advance.
> 
> Thanks.  I don't understand why adjustments to note_tab_bar_highlight or
> note_tool_bar_highlight are warranted, and I think this ought to be
> optional.
> 
> ChangeLog entries are also absent from the commit messages.

I'd appreciate a walkthrough of the patches with explanations for the
significant hunks.  It's a non-trivial change, so I think the
rationale and the main ideas of the implementation should be described
and discussed.

I also have difficulty understanding comments like this one:

   /* Clear mouse face but the mouse cursor.  */

What does it try to say?