Copying/pasting nested lists in IE results in flat list

[Jakub Ś]

Steps to reproduce

1. Open replacebycode sample in IE and create nested list in the editor or just paste below code:

   <ol>
   	<li>one
   	<ol>
   		<li>two</li>
   		<li>three</li>
   	</ol>
   	</li>
   	<li>four</li>
   </ol>
   

2. Select list with a mouse (from one to four or from four to one)
3. Paste the list somewhere below existing one (enter down if necessary)

Expected result

Nested list should be pasted.

Actual result

Flat list or single level list gets pasted into editor.

Other details (browser, OS, CKEditor version, installed plugins)

The same problem can be reproduced in native IE. Please use attached file. Just select, copy and paste the nested list below existing list.

[Jakub Ś]

Problem can be reproduced in IE9+

[Jakub Ś]

Issue for Microsoft has been reported here: ​https://connect.microsoft.com/IE/feedback/details/2232866/ie9-11-edge-contenteditable-copying-and-pasting-nested-lists-results-in-flat-list