bug#68947: 30.0.50; Gnus article mode keybindings

[Eli Zaretskii]

> From: Eric Abrahamsen <eric@ericabrahamsen.net>
> Cc: pranshusharma366@gmail.com,  68947@debbugs.gnu.org
> Date: Sat, 17 Feb 2024 10:13:02 -0800
> 
> Eric Abrahamsen <eric@ericabrahamsen.net> writes:
> 
> > On 02/10/24 20:15 PM, Eli Zaretskii wrote:
> >>> Cc: 68947@debbugs.gnu.org
> >>> From: Eric Abrahamsen <eric@ericabrahamsen.net>
> >>> Date: Sat, 10 Feb 2024 10:09:14 -0800
> >>> 
> >>> Your immediate issue is caused by the fact that
> >>> `gnus-article-describe-bindings', which theoretically should be
> >>> responsible for telling the user about all the redirections, is only
> >>> aware of the "S" keymap prefix. It doesn't know all the ways in which an
> >>> 'undefined binding might get translated into a valid summary-mode
> >>> command, and can't show you those.
> >>> 
> >>> To be honest, I don't think I'm going to be able to fix this. If we keep
> >>> the current implementation, `gnus-article-describe-bindings' would have
> >>> to be made aware of the additional redirections, and I wouldn't even
> >>> know where to start.
> >>> 
> >>> It could be that Elisp has better tools for this situation by now (the
> >>> original architecture was in place before 1997), but I'm not sure what
> >>> those tools are. Perhaps someone will chime in with a helpful
> >>> suggestion...
> >>
> >> Strange as it may sound, I see no grave problem here: C-h is not
> >> guaranteed to work after any arbitrary prefix, anyway.  So if that is
> >> too hard to fix, we could just punt and leave it unsolved.
> >
> > I'm inclined to say it's too hard to fix! The only cleaner solution I
> > can think of is to actually define article-mode versions of all the
> > summary-mode commands we'd want to call, which would also provide a
> > place to do the necessary article-specific adjustments. That's a lot of
> > very tightly-coupled code, though.
> >
> >> What about "C-h b" -- does that work in the situation described by the
> >> recipe?
> >
> > No, that doesn't really work. The gnus-article-mode bindings are listed
> > under a "fundamental-mode Major Mode Bindings:" heading (??). That
> > includes gnus-article-mode's own keybindings, and the summary-mode
> > bindings that have been explicitly attached at the "S" prefix, but
> > nothing else.
> 
> I don't know, I don't see a good solution to this without a massive
> rewrite, which I don't have the stomach for right now. Should we leave
> the bug open, since it's a real problem?

Fine with me.