bug#50959: 28.0.50; Shorthand symbols are unknown to Emacs

[Eli Zaretskii]

> From: João Távora <joaotavora@gmail.com>
> Date: Sat, 2 Oct 2021 15:02:41 +0100
> Cc: Phil Sainty <psainty@orcon.net.nz>, 50959@debbugs.gnu.org
> 
> > > 0. no integration
> > >
> > > 1. This is the current integration.  I.e. when C-h o is pressed on the
> > >    symbol the global name is discovered and used as the default.  This
> > >    is how SLIME work with CL's namespacing system.  SLIME is a very well
> > >    tested and widely appreciated Common Lisp IDE for Emcas.
> > >
> > > 2. The shorthands from the buffer where the minibuffer was entered are
> > >    _not_ in the completions list, but typing one of them interns the
> > >    symbol with those shorthands present, so you get the desired result.
> > >    This would fix Phil's visually-copy-and-type scenario.
> > >
> > > 3. (Eli's suggestion): the completion list would be augmented with the
> > >    shorthands from the buffer where the minibuffer was entered from.
> >
> > Are 2 and 3 significantly different (from the implementation POV)?
> 
> I think so.
> 
> I think 2 can be achieved by setting elisp-shorthands buffer-locally
> in the minibuffer and removing the "require-match" flag requirement to
> whatever completing-read call happens there.
> 
> 3 is achieved by calculating the list of completions using
> 'elisp--completion-local-symbols` and then filtering it down as usual.
> "require-match" is kept untouched.

You are saying that 3 is easier than 2?  Then I think we should do 3,
as it's better from the user's POV, right?