Re: Current mode command discovery

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Sun, 21 Feb 2021 13:55:39 +0100
> Cc: emacs-devel@gnu.org
> 
> > - `digit-argument'.  Should it be in `M-x', or is it more like
> >   `mwheel-scroll'?  Should it be in `M-S-x'?
> >
> > - `negative-argument', I can see why one would keep it in `M-x', I
> >   guess, but in `M-S-x'?
> 
> Yes, these don't seem useful to list, and they'll appear in all the
> modes...  however, perhaps they should have a `ignore' completion
> predicate.  That is,
> 
> `M-x digit-argument'
> 
> never seems to actually do anything?  Are there cases where doing that
> would do anything useful?

Careful: the completion predicate is not just for M-x, it is also for
"C-h x" and other commands that complete on functions and commands.