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

[Eli Zaretskii]

> From: João Távora <joaotavora@gmail.com>
> Cc: philipk@posteo.net,  monnier@iro.umontreal.ca,  62720@debbugs.gnu.org,
>   larsi@gnus.org
> Date: Wed, 12 Apr 2023 12:00:04 +0100
> 
> Had another idea: what about this very tiny patch, then?  It makes `M-x
> package-install` work for installing a :core package.  This also rhymes
> exactly with Stefan's intution/feeling that :core packages need to be
> "installed" to promote them to installable.  The current M-x
> package-install recommendation could remain flawlessly and then you can
> do whatever you think is best for M-x package-update & friends.

This has the same problem: it modifies a function that is called in
too many places.  package-installed-p has half a dozen callers in
package.el alone.  The change is tiny, but what about its
implications on every use case where it is involved?

So I still think a special command for updating a core package will be
a better, safer solution, and the reasons for that are more than just
this one, as mentioned up-thread.