bug#55362: 29.0.50; Super key no longer works on Wayland

[Eli Zaretskii]

> Resent-From: Lars Ingebrigtsen <larsi@gnus.org>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@gnu.org
> Resent-Sender: help-debbugs@gnu.org
> Cc: Po Lu <luangruo@yahoo.com>, 55362@debbugs.gnu.org
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 11 May 2022 15:04:25 +0200
> 
> Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs@gnu.org> writes:
> 
> > That patch (and the old code) is incorrect, and the code before its
> > removal was another example of the PGTK port haphazardly copying code
> > from xterm.c to do stuff GDK is supposed to do by itself.  Mod4 is a
> > real modifier and can correspond to any (number) of virtual modifiers,
> > which might or might not contain Super.
> 
> But this seems to affect many people who had a working Super key before,
> so I think we should re-fix this on the Emacs side.

I agree.  At the very least, how about a knob, by default off, to
restore the previous behavior; we could then have that in PROBLEMS.