Selection at the beginning of paragraphs is broken on IE9 and IE8

[Jakub Ś]

I have found it when checking #9093

To reproduce:

1. Insert below code and switch to WYSIWYG

   <p>aaa</p>
   <p>bbb</p>
   <p>ccc</p>
   

2. Try to select 'bbb' but start your selection a little bit to the left of 'bbb' like shown in picture.
3. Once bbb is selected press Enter key

Result: new line is inserted above 'aaa'

Alternative step 3:

3. Once bbb is selected, press Link button and insert a link. Note that the link is inserted in the wrong place (at the end of contents).

This issue has only been reproducible in IE8 and IE9 from CKEditor 3.6.3

[Jakub Ś]

Reproducible from rev. [7374]