Firefox doesn't clear selection on RichCombo's

[Michael Camden]

Affected Versions: Firefox 3.6/4 Possibly others

Steps to reproduce: (Using ckeditor.com/demo)

1. Type three lines of text
   
2. Change the color on the second line of text
   
3. Change font on the last line of text
   
4. Select the first line of text, click on the font drop down you will see the last font is still selected.
   
5. Keep the text selection and click on the color drop down, you will see the last color is still selected.
   

Expected result:
If you are selecting non-stylized text, nothing should be selected.

[Jakub Ś]

Hasn't worked in Opera and FireFox from CKEditor version 3.0.

I was able to reproduce it with a slightly different scenario

1. Type three lines of text
2. Change the color on the second line of text
3. Select first or third line click on the color drop down, you will see the last color is still selected.
4. Change font on the last line of text
5. Select the first or the second line of text, click on the font drop down you will see the last font is still selected.

You might say that last selection is active even for unformatted lines of text.

[Garry Yao]

DUP of #6671