bug#16644: 24.3.50; Can't get Git Org mode info files before info files bundled with Emacs

[Eli Zaretskii]

> From: "Sebastien Vauban" <sva-news@mygooglest.com>
> Cc: rgm@gnu.org,  16644@debbugs.gnu.org
> Date: Thu, 06 Feb 2014 23:10:14 +0100
> 
> 1. Setting `Info-additional-directory-list', such in this MWE (just that
>    to launch Emacs with, nothing else [1]):
> 
> --8<---------------cut here---------------start------------->8---
>    ;; Org-mode
>    (add-to-list 'load-path "~/Public/Repositories/org-mode/lisp")
>                                            ; modify the paths to suit your 
> environment!
> 
>    (setq Info-additional-directory-list
>          `(,(expand-file-name
>              (concat (file-name-directory (locate-library "org")) "../doc/"))
>            "c:/cygwin/usr/share/info/"))

Any reasons why you use backticks here?

> --8<---------------cut here---------------end--------------->8---
> 
>    has NO IMPACT on Info-directory-list (C-h v following an initial C-h i).

It shouldn't: Emacs does not modify Info-directory-list using
Info-additional-directory-list, it uses them both when appropriate,
and searches Info-directory-list first, followed by
Info-additional-directory-list.  Like the doc string of
Info-additional-directory-list says:

  List of additional directories to search for Info documentation files.
  These directories are searched after those in `Info-directory-list'.

> 2.  Setting `Info-default-directory-list', such in this MWE:
> 
> --8<---------------cut here---------------start------------->8---
>    ;; Org-mode
>    (add-to-list 'load-path "~/Public/Repositories/org-mode/lisp")
>                                            ; modify the paths to suit your 
> environment!
> 
>    (setq Info-default-directory-list
>          `(,(expand-file-name
>              (concat (file-name-directory (locate-library "org")) "../doc/"))
>            "c:/cygwin/usr/share/info/"
>            ,@Info-default-directory-list))
> --8<---------------cut here---------------end--------------->8---
> 
>    DOES CHANGE the variable `Info-directory-list', but my path is put
>    AFTERWARD:
> 
>    ╭────
>    │ Its value is
>    │ ("c:/Program Files (x86)/emacs-trunk/share/info/"
>    │ "d:/Users/fni/Public/Repositories/org-mode/doc/"
>    │ "c:/cygwin/usr/share/info/")
>    ╰────
> 
> In both cases, I get the doc of Org mode 8.2.5c, the one built with the
> Emacs from a couple of days ago.
> 
> Don't you get the same results as me if you try the above recipe?

These results are expected, I think.  The doc string of
Info-directory-list says, among other things:

  If you want to override the order of directories in
  `Info-default-directory-list', set INFOPATH in the environment.

So I suggest to do just that.