[IE] Focus is broken in several cases.

[Olek Nowodziński]

1. Go to ​http://ckeditor4.t/ckeditor/samples/api.html
2. Change the content of textarea (by editing the sample, not by editor's source view)

   <table>
   	<tr>
   		<td>cell</td>
   	</tr>
   </table>
   <br />
   <hr style="margin: 30px 0"/>
   <ol>
   	<li>item</li>
   </ol>
   

3. Click inside of the first table cell. No focus.
4. Blur the editor. Click the list item. Now the editor has focus (editor1 is focused).

• IE7+ (tested).
• This may refer to #9224. However the solution proposed in that ticket doesn't fix this problem.
• The problem has been found while working on #9251.

[Garry Yao]

There's a problem with the (focus event) bubbling check, on editable element.

[Garry Yao]

Fixed on master with

​https://github.com/ckeditor/ckeditor-dev/commit/314ee8d405d68d3d576cf3e4178b68346507fd30