bug#62720: 29.0.60; Not easy at all to upgrade :core packages like Eglot

[Eli Zaretskii <eliz@gnu.org>]

> From: Philip Kaludercic <philipk@posteo.net>
> Cc: joaotavora@gmail.com,  monnier@iro.umontreal.ca,  62720@debbugs.gnu.org
> Date: Sat, 15 Apr 2023 17:14:41 +0000
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > The user option allows those users who always want package-install to
> > upgrade core package to have what they want, easily.  So I think we
> > should keep it.  On master, the option could be t by default, or
> > become unnecessary if that's what happens (but I wouldn't bet on
> > that).
> 
> My argument against a user option is just that the whole deal is
> something that will in practice at most affect two packages (if we
> change the behaviour in Emacs 29).  Is it really worth adding a general
> option for this very specific situation?

I think we should count users of those packages, not just the packages
themselves.  Yes, I think it's worth it, because we don't know how
many of the users will want the built-in packages to be included in an
update.

> >   "Return non-nil if PACKAGE if the built-in version is used."
> >
> > See those two "if"s?  And even if I replace the second "if" with "is",
> > the sentence doesn't make sense.
> 
> Right, how does
> 
>   "Return non-nil if the built-in version of PACKAGE is used."
> 
> sound?

I think we should explain what does "the built-in version of PACKAGE
is used" mean, in the context in which this predicate is used.  Maybe
say something like

    Return non-nil if the built-in version of PACKAGE is used.
  If the built-in version of PACKAGE is used and PACKAGE is
  also available for installation from an archive, it is an
  indication that PACKAGE was never upgraded to any newer
  version from the archive.