Open https://docs.google.com/document/d/1r-FFOXrCfNpuzMGSl0UCA5ACL4BmUT18sRywxFEkkw8/edit#. Copy all the text in the document. Try to paste the text into a VisualEditor surface. Nothing visible will happen, and the console will log the error "Cannot insert list even after closing all containing nodes".
|VisualEditor/VisualEditor : master||Fix structure of broken nested lists from Google Docs|
Have reported on their help forums in the meantime:
To get what they intended we shouldn't be wrapping the second list, but moving it up into the first listitem:
<ul> <li> B <ul><li>C</li></ul> </li> </ul>
This makes the task much more complex as we are essentially guessing a sensible structure based on our knowledge of how people incorrectly write list markup. Any fixes for this would be a hack specifically for lists.
Are you sure that this requires a nested list? I can't paste any lists at all (not even a single item individually selected from a list), from Google docs into VisualEditor (using Safari). If I remove the list formatting from the item, then it pastes correctly.