IE9: Cursor jumps to start of next list level when we press tab to create another list level

[Satya Minnekanti]

To reproduce the defect:

1. Open any CK Editor sample

2. In Editor body, create a list with 2 list items

3. Press Enter & Tab to create first sub list

4. Press up arrow key to go to second list item in top level

5. Press Tab key

Expected Result: A new sub list created with 2nd list item as first item in newly created sub-list and focus stays at end of newly created sub list

Actual Result: A new sub list created with 2nd list item as first item in newly created sub-list but focus jumps to first list item in next level

[Jakub Ś]

Problem can be reproduced in IE8-10 from CKEditor 4.2