[BUG] adding new plain lists item changes previous one it it ends in a number on a single lijne followed by a dot

[Gregor Zattler <telegraph@gmx.net>]

Dear org-mode developers,

adding a new list item via M-RET (org-insert-heading) may change
text in a previous list item, if this ends in a number on a
single line followed by a dot:

-------------------------------
- Several astonishing things happened in
  2007.
- And then there was another item.X
-------------------------------

When typing M-RET with cursor at X I would expect the following
outcome (again with X marking the cursor position):

-------------------------------
- Several astonishing things happened in
  2007.
- And then there was another item.
- X
-------------------------------

This is the correct result when using Emacs 23.2 with its
org-mode 6.33.


But with today's org-mode "Org-mode version 7.5
(release_7.4.300.g0b7c)" I instead get:

-------------------------------
- Several astonishing things happened in
    1. 
- And then there was another item.
- X
-------------------------------

Note that "  2007." has changed to "    1." in line 2.


The same bug is present in the maintenance version "Org-mode
version 7.5 (release_7.4.3.g76a2)".


This only happens when the number is followed by a dot.  Without
the dot both new versions of org-mode do not change the number on
the last line of the first item.


I did all tests with "emacs -nw -Q" and with Emacs 23.2 and
24.0.50 as of 2011-01-16.


Fixing bugs in org-mode is beyond me.

Ciao; Gregor
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