After choosing a diferent font spacing, the preview of the "no preference" option is displayed as wider than the selected one

After choosing a diferent font spacing, the preview of the "no preference" option is displayed as wider than the selected one

Steps to reproduce

1) Open the Sakai mock-up example:
http://build.fluidproject.org/fluid/sample-code/shared/sakai/sakai.html#

2) Click on the "Edit Appearance" button

3) Change the font spacing and save the change

4) Click on the "No Preference" option, notice that the font spacing is displayed as being wider than the current font spacing. However, saving this change, will put the font spacing back to the original font spacing, which is narrower.