[IE8-11] selectionChange event outputs invalid element when Ie is in Compatibility mode.

[Jakub Ś]

1. Put attached api2.html sample into samples folder
2. Open sample in IE browser
3. This sample contains code for selectionChange:

   selectionChange : function(evt){
   	var htmlElement = evt.data.selection.getStartElement();
   	console.log(htmlElement.getText());
   }
   

4. Set compatibility mode for current page e.g. Top Menu -> Tools -> "Compatibility View"
5. Click on "Set Editor Contents" button
6. Click on "Objective".
7. IE will report

   Main Title
   Objective
   

8. Scroll Down and double-click on "Description". You may need to double-click few times.
9. Editor will report:

   Main Title
   Description
   

This doesn't happen in standard IE mode. Whenever you click on element, only its description gets reported.

Problem is reproducible in CKE 4.0 beta.