IE8 IE9: empty paragraphs inserted when aligning text

[Jakub Ś]

1. Open replacebycode sample and clean editor contents
2. Type 'wwwwwwwwwwwwwwwwwww' or similar
3. Select whole text with a mouse
4. Set "heading 2" and font-size 14 using toolbar buttons
5. Press CRTL+C
6. The text should still selected so press right arrow to go to the end of text
7. Press Enter
8. Press CRTL+V few times (6-7 will do) or CRTL+V and Enter if cursor doesn't move to new line automatically after paste.
9. Select whole text with CRTL+A
10. Now toggle with "Align Right" and "Align Left"

Result: Empty paragraphs are inserted between lines of text.

Issue is reproducible in IE8 and IE9 from CKE 3.0