Breaking line inside list item

[Sébastien Miquel]

Hi,

Is there a binding or functionality to go from this, (where | is the 
cursor position):

 - Cogito, |ergo sum.

To this:

 - Cogito,
   |ergo sum.

Pressing enter + tab (calls ~indent-for-tab-command~) doesn't work : the 
line is indented to the dash instead. Although ~indent-for-tab-command~ 
does indent correctly when called in an empty line after a list item.

In the case of nested list, a way to cycle the indentation to that of 
the main or inside list would also be nice.