bug#71356: use-package doesn't load org from elpa

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 71356@debbugs.gnu.org
> From: Andrea Corallo <acorallo@gnu.org>
> Date: Tue, 04 Jun 2024 17:44:37 -0400
> 
> Seems the issue is in 'use-package-ensure-elpa' where we gate any
> installation with "(unless (package-installed-p package)".  I think we
> should progress also if we see that the package is built-in and is
> actually pinned.
> 
> The attached seems to do the job for me, but I'm not 100% sure it's the
> best/right fix so I'd appretiate someone else to have a look.

Isn't this because we require an explicit directive by the user in
order to upgrade a built-in package?  The Emacs user manual says:

     By default, ‘package-install’ doesn't consider built-in packages for
  which new versions are available from the archives.  (A package is
  built-in if it is included in the Emacs distribution.)  In particular,
  it will not show built-in packages in the list of completion candidates
  when you type at its prompt.  But if you invoke ‘package-install’ with a
  prefix argument, it will also consider built-in packages that can be
  upgraded.  You can make this behavior the default by customizing the
  variable ‘package-install-upgrade-built-in’: if its value is non-‘nil’,
  ‘package-install’ will consider built-in packages even when invoked
  without a prefix argument.  Note that the package-menu commands (*note
  Package Menu::) are also affected by ‘package-install-upgrade-built-in’.

     By contrast, ‘package-upgrade’ and ‘package-upgrade-all’ never
  consider built-in packages.  If you want to use these commands for
  upgrading some built-in packages, you need to upgrade each of those
  packages, once, either via ‘C-u M-x package-install <RET>’, or by
  customizing ‘package-install-upgrade-built-in’ to a non-‘nil’ value, and
  then upgrading the package once via the package menu or by
  ‘package-install’.

We had a long (and somewhat heated) discussion about this a year ago,
see bug#62720.

Philip, am I missing something?