Nested contenteditable elements path not updated with divarea plugin

[f1ames]

Are you reporting a feature request or a bug?

Bug

Provide detailed reproduction steps (if any)

1. Use CKEditor with divarea plugin.
2. Set content to:

<p>You can type here
    <strong contenteditable="false">This is uneditable part 
        <em contenteditable="true">and you can type again inside this editable part<u> and some underline inside</u></em>
    </strong>
</p>

3. Put selection inside plain text (e.g. <p>You ca^n type here...).
4. Put selection inside <em contenteditable=true>.

You can use this codepen to reproduce the issue https://codepen.io/f1ames/pen/oojraB.

Expected result

Elements path is updated.

Actual result

Elements path does not change.

Other details

• Browser: FF
• OS: OS X
• CKEditor version: 4.4.0 (oldest I have tested on)
• Installed CKEditor plugins: divarea, elementspath