Fix cursor position when bullet length has changed

Fix cursor position when bullet length has changed

Dan Davison writes:

> If you start a numbered list with
>
> 1.
>
> and hit M-RET then you get
>
> 2.
>  ^
> with a space, i.e. '2. '
>
> However, when creating the 10th list item, there is no space after
> '10.'. Same for 99 -> 100. This isn't entirely trivial, because if you
> start typing blindly after hitting M-RET, then the line you have created
> (lacking the space) will not be recognised as a list item and so
> e.g. the next M-RET will create a new heading, not a list item. [Has
> this changed recently? This seems like something obvious that others
> would have noticed.]
>
> Here's my patch.
>
> --8<---------------cut here---------------start------------->8---
> diff --git a/lisp/org-list.el b/lisp/org-list.el
> index 2fea57b..8ece3ea 100644
> --- a/lisp/org-list.el
> +++ b/lisp/org-list.el
> @@ -813,7 +813,7 @@ with something like \"1.\" or \"2)\"."
> 	      (buffer-substring (point-at-bol) (match-beginning 3))))
> 	;; (term (substring (match-string 3) -1))
> 	ind1 (n (1- arg))
> -	fmt bobp old new)
> +	fmt bobp old new delta)
>     ;; find where this list begins
>     (org-beginning-of-item-list)
>     (setq bobp (bobp))
> @@ -835,7 +835,9 @@ with something like \"1.\" or \"2)\"."
> 	  (delete-region (match-beginning 2) (match-end 2))
> 	  (goto-char (match-beginning 2))
> 	  (insert (setq new (format fmt (setq n (1+ n)))))
> -	  (org-shift-item-indentation (- (length new) (length old))))))
> +	  (setq delta (- (length new) (length old)))
> +	  (org-shift-item-indentation delta)
> +	  (if (= (org-current-line) line) (setq col (+ col delta))))))
>     (org-goto-line line)
>     (org-move-to-column col)))
> --8<---------------cut here---------------end--------------->8---
>
> Dan