FF: "Style Lists" don't refresh after deleting the text with backspace

[Jakub Ś]

1. Start with empty editor
2. Change font size to 72
3. Type three letters
4. Delete three letters using backspace (press backspace more than three times so that there is no doubt whether the formatting was completely removed)
5. Type three letters again

Results:

Firefox - Size shows 72 but the typed letters are small. The drop down list is not refreshed. This hasn't worked form CKEditor 3.5.3 rev [6586]. The same thing happens for Style, Format and Font dropdown lists.

IE and Opera - the dropdown list is not refreshed but the typed letters are of size 72. It has always worked that way so I believe it's fine.

Webkit - works fine. Size drop down list is refreshed and typed letters are small.