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

[Eli Zaretskii <eliz@gnu.org>]

> From: Pedro Andres Aranda Gutierrez <paaguti@gmail.com>
> Date: Thu, 6 Jun 2024 17:07:02 +0200
> Cc: Philip Kaludercic <philipk@posteo.net>, acorallo@gnu.org, 71356@debbugs.gnu.org
> 
>  > IIUC the feature would be that if a use-package form has a
>  > 
>  >      :pin gnu
>  > 
>  > argument, then this is an indication that we want to install the package
>  > from GNU ELPA, disregarding the fact that Emacs already has a built-in
>  > version of the same package.  Sort of a package-local version of
>  > `package-install-upgrade-built-in'.
> 
>  I'm not sure.  People tend to copy/paste recipes from the Internet
>  without really understanding what they do.  I think a simple :pin
>  should not be sufficient, we need some specialized keyword (in
>  addition to supporting package-install-upgrade-built-in).
> 
> I didn't arrive at trying :pin gnu from anything in the Internet, but from
> reading the use-package documentation (just this time ;-) )
> 
>  > I am not familiar with the use-package code, but it seems like we could
>  > implement this generally in package-install, by checking
>  > `package-pinned-packages'.
> 
>  I would prefer not to introduce another indication of whether built-in
>  packages should or should not be upgraded.  If we do, we will next
>  need to decide which one "wins" when they contradict each other.
> 
>  
> My feeling is that if I set package-install-upgrade-built-in to t and pin
> a package to (say) gnu elpa, that should be enough.

I agree.  I was responding to the suggestion that just :pin should be
enough.  That use-package currently ignores
package-install-upgrade-built-in is a bug we should surely fix.