bug#67458: 30.0.50; Emacs Pgtk doesn't recognize Hyper key on Linux Wayland

[Eli Zaretskii]

> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Mon, 25 Dec 2023 06:34:45 -0800
> Cc: 67458@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> From: Eval Exec <execvy@gmail.com>
> >> Date: Sun, 26 Nov 2023 18:31:31 +0800
> >>
> >> Hello, I'm have an Emacs Pgtk build from NixOS's emacs-overlay,
> >> And I Re-maped left ctrl key as Hyper key, and set the Hyper key as Mod3:
> >> ```bash
> >> $ xmodmap
> >> xmodmap:  up to 4 keys per modifier, (keycodes in parentheses):
> >>
> >> shift       Shift_L (0x32),  Shift_R (0x3e)
> >> lock
> >> control     Control_L (0x42),  Control_R (0x69)
> >> mod1        Alt_L (0x40),  Alt_R (0x6c),  Alt_L (0xcc),  Meta_L (0xcd)
> >> mod2        Num_Lock (0x4d)
> >> mod3        Hyper_L (0x25),  ISO_Level5_Shift (0xcb),  Hyper_L (0xcf)
> >> mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce)
> >> mod5        ISO_Level3_Shift (0x5c)
> >> ```
> >>
> >> As you can see, `Hyper_L` is `mod3`.
> >>
> >> But when I open `emacs-pgtk` and M-x describe-key, then press
> >> `Hyper_L` (original left control) and `p` key, emacs just recognizes
> >> it as a single `p` key. This is not expected. I expect Emacs will
> >> recognize its `H-p` key.
> >>
> >> And I can confirm this issue does not happen on non pgtk emacs. Emacs
> >> non-pkgtk  will recognize `Hyper_L` + `p` as `H-p` in `describe-key`.
> >
> > This is a known problem, see etc/PROBLEMS (search for "PGTK").
> >
> > Unfortunately, there's no known solution or workaround.
> 
> Do we leave this bug open?  Tag it as "help"?  "wontfix"?

The latter, I think.