bug#49466: 28.0.50; C-<mouse-2> is undefined

[Eli Zaretskii]

> Date: Thu, 08 Jul 2021 22:22:04 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 49466@debbugs.gnu.org
> 
> > From: Juri Linkov <juri@linkov.net>
> > Date: Thu, 08 Jul 2021 20:36:22 +0300
> > 
> > The Info manual says in (info "(emacs) Menu Mouse Clicks")
> > 
> >   ‘C-mouse-2’
> >        This menu contains entries for examining faces and other text
> >        properties, and well as for setting them (the latter is mainly
> >        useful when editing enriched text; *note Enriched Text::).
> > 
> > But clicking C-mouse-2 signals the error:
> > 
> >   C-<mouse-2> is undefined
> 
> That's because that binding was removed as part of butchering
> facemenu.el in Emacs 28.

I resurrected the C-mouse-2 binding, but it still needs facemenu to be
loaded before it will work.

Stefan, is there some way to make this auto-loaded?  That is, whenever
the user presses C-mouse-2, automatically load facemenu and show the
drop-down menu in facemenu-menu?  I tried autoloading the
facemenu-menu keymap like ispell and pcvs do, but that doesn't seem to
work, in the sense that pressing C-mouse-2 complains that the binding
is not a command.