Re: emacs-29 9b775ddc057 1/2: ; * etc/EGLOT-NEWS: Fix wording of last change.

[Dmitry Gutov]

On 06/05/2023 16:22, Eli Zaretskii wrote:
> > From: João Távora <joaotavora@gmail.com>
> > Date: Sat, 6 May 2023 14:03:02 +0100
> > Cc: Dmitry Gutov <dmitry@gutov.dev>, emacs-devel@gnu.org
> >
> > On Sat, May 6, 2023 at 11:52 AM Eli Zaretskii <eliz@gnu.org> wrote:
> >
> > > I'm surprised, to say the least.  To recap:
> > >
> > >    . the entire discussion of bug#62720, of which this is fallout, was
> > >      about allowing package-install to upgrade Eglot, and according to
> > >      João, that's what package-install did before Emacs 29.  Was this
> > >      all based on a mistake? if so, why no one has said so in all that
> > >      long argument??
> >
> >
> > One more time: in Emacs 28 package-install doesn't upgrade,
> > but it installs the latest, which is incompatible behaviour
> > if you move to Emacs 29, where that won't happen.
>
> Is this for Eglot (and use-package), or is this for any package
> installed from ELPA?  IOW, does Emacs 29's package-install still
> install the latest version of a package from ELPA?  And does that
> happen even if some older version of a package is already installed?

Like Joao said:

  Yes to the first, no to the second.

Meaning, 'M-x package-install' will install the latest version (or some 
available version) from ELPA, if the package is not installed.

If some version of it is installed from ELPA (!) already, 'M-x 
package-install' won't upgrade.

> > So if you're used to setting up a brand new Emacs 28 and
> > package-install Eglot to get versions with nice features and
> > bugfixes, you may be dismayed to find that doing the very
> > same thing in Emacs 29 results in what will probably be a
> > old version.
>
> Are you talking about users who didn't update their Eglot, except when
> a new Emacs version was released?  Or are you talking about users who
> updated Eglot from ELPA (using package-install) even between Emacs
> releases?  Or are you talking about something else entirely?

He is mostly talking about users who e.g. wiped their config directory 
and ~/.emacs.d/elpa and are starting anew. Or just deleted 
~/.emacs.d/elpa/eglot-xxxxxx. In that situation, indeed, 'M-x 
package-install' will install the latest version from ELPA.

In Emacs 29, however, it won't. Because one version of Eglot is 
available already (built-in).

I'm pretty sure I have outlined this twice already, not too long ago. 
Prefacing the first message with an apology, saying I had been 
previously confused myself.