Problems when pasting lists from word

[Jakub Ś]

This issue was found when reproducing #7982

1. Paste the list from the attached file to CKEditor
2. The last second-level list items will be changed to first-level list items.

The file contains description how this list was created in WORD.

Pasting such lists worked till version 3.6.
From revision [6911] it got broken. All elements were pasted as first level list-items.
In rev [6977] there was a slight improvement. Items after first sub-list weren't pasted.
From rev [7008] it works as described above.