bug#56117: 29.0.50; pgtk does not distinguish between <kp-separator> and "."/","

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 56117@debbugs.gnu.org, stefan@marxist.se, qsx@chaotikum.eu
> Date: Thu, 23 Jun 2022 16:16:41 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > And as both Eli and I have said, we think those changes you've made to
> > pgtk here should be reverted so that these keys work as before.
> 
> This isn't the super-key related bug, and in fact they shouldn't have
> been merged.  No amount of changes on our side can work around input
> methods swallowing the shift modifier in "C-S-u" and the "kp-" in
> "kp-separator".

Maybe we are talking about an issue that is not understood well enough
by some participants (e.g., myself).  Can you please describe in more
detail what causes this particular issue?

> > Even though it's "wrong".  Maintaining a user-facing program like
> > Emacs is 70% dealing with bugs and misfeatures in other systems we're
> > interfacing with.
> 
> I'm trying to figure out how all of that fits together in Wayland to
> hopefully fix it in GTK upstream.  Hard-coding real modifier values is
> very fundamentally wrong under both X and GTK, and leads to extremely
> hard-to-diagnose problems down-the-road.

Instead of hard-coding them, we could have them in some Lisp data
structure, where both changing them and eliminating them altogether
will be much easier.  Just an idea.