[O] org-insert-subheading doesn't work well with colons

[Leo Ufimtsev]

When I have a plain list entry like this and issue org-insert-heading:

- Meaning of life ::

I expect something like this:

- Meaning of life ::
- 

Instead, it is inserted above the current item, like:

- :: 
- Meaning of life

I'm running emacs 25.0.50.3

Thoughts?

Leo Ufimtsev | Intern Software Engineer @ Eclipse Team