[Orgmode] A bug in org-fix-bullet-type

[Leo]

Hello,

In an org buffer with the following:

1. one
   - another one|
2. two
3. tree

Place the point at | and M-left, the point will no longer at |.

I think this is due to org-fix-bullet-type which restores point position
by column. But org-fix-bullet-type could insert different length of text
depending on the list item type (ie - or 1. or 1)).

Cheers,
Leo