bug#64270: 30.0.50; Font update for no toolkit menu

[Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Manuel Giraud <manuel@ledu-giraud.fr> writes:

> That is interesting.  This means that a face used in a frame might not
> exists in a form that is loadable by XLoadQueryFont, right?  So I think
> it is real shortcoming of what I wanted to do.

Yes.  The X core font requests can only utilize fonts that are present
on the X server, which precludes using any font from a FreeType-based
font driver.

> Yes, I know.  Everytime I'm trying to do something on oldXMenu this idea
> keep resurfacing.  But it is quite a task and oldXMenu is already here
> and not that bad.  Do you think that child frames could be a starting
> point for menus?

I don't think so; frames are quite resource intensive and slow to
create.  Child frames have also always been a mess, and they are
obscured by ancestor windows.  If we were to implement menus in terms of
frames, it would be better to apply an owner-events grab to an
override-redirect frame (as usual among X clients), but even that would
be slow.