[IE8] Can not expand selection when caret is at the end of a inline element

[Marek Lewandowski]

checked only on IE8, but this issue might be also present in other IE versions

1. open any sample with CKEditor (i.e. samples/replacebyclass.html)
2. using "Source" button set content to following markup:

   <p>aa bb<u> cc </u>dd ee</p>
   

3. go back to wysiwyg mode
4. place caret in following position aa bb cc |dd ee
5. press ctrl + shift + right arrow

Expected result:
Selection should be expanded to contain dd string.

Current result:
Selection is not expanded.

additional info:

1. i've tested it with bold, italic - they have the same issue too

[Jakub Ś]

I see this problem is happening in native IE8 as well (other browsers work fine) but we could have this fixed in editor.