bug#60762: 28.2; info--manual-names ignores Info-additional-directory-list

[Eli Zaretskii]

> From: Sean Devlin <spd@toadstyle.org>
> Date: Thu, 12 Jan 2023 18:44:50 -0500
> 
> Info.el gives the following advice for customizing the Info manual
> search path:
> 
> "Normally, you should either set INFOPATH or customize
> `Info-additional-directory-list' ..."

This text was removed, and will not appear in Emacs 29 and later.

> The variable Info-additional-directory-list is intended as the main
> Lisp-level customization point for users.

That is inaccurate.  The main Lisp-level customization variable for
users is Info-default-directory-list.  So the question I'd like to ask
before discussing the situations you describe is why don't you
customize Info-default-directory-list instead?

Thanks.