bug#55787: 29.0.50; inconsistent sort order with ls-lisp-version-lessp

[Eli Zaretskii <eliz@gnu.org>]

> From: TAKAHASHI Yoshio <yfb02119@nifty.com>
> Date: Sat, 04 Jun 2022 08:21:48 +0900
> 
> I encounter an inconsistent sort result.  The position of "01.0" and/or
> "01.2" seems wrong.
> 
> 
> $ cat /tmp/test.el
> (require 'ls-lisp)
> (print (sort (vector "01.0" "10" "010" "01.2")
>              (lambda (x y)
>                (ls-lisp-version-lessp x y))))
> $ emacs -Q --batch -l /tmp/test.el
> 
> ["01.0" "10" "010" "01.2"]

Why do you think this is wrong?  This function is not meant to compare
dotted versions with undotted ones, only dotted to dotted or undotted
to undotted.  The strings are supposed to be file names, where a dot
begins an extension.

See the node "More details about version sort" in the GNU Coreutils
manual for more info.

If you want a general-purpose version-comparison function, use
version< instead.