Basically the testing instructions of MDL-44063 fail on webkit browsers (at least) when creating the text after a list:

1. In ie9, ie11, firefox, chrome, safari, ios safari, android stock
2. Open atto on a page with no text already entered in the editor (exmaple: new blog entry)
3. focus on the editor and type some text
4. Hit enter - the content should be split into 2 paragraphs (with some margin between them)
5. convert the 2 paragraphs to a list
6. hit enter twice on the second list item to break out of the list
   Expected result:
   the content after the list should be in a paragraph
   Actual result:
   The content after the list is a div