* If some elements in `.fonts.conf` were deleted (default), they weren't updated anymore, and cause inconsistency between the value displayed in the KCM and what is actually applied.
* UI consistency : when the user uncheck `enable AA`, then the style is set to `None` instead of default value. Also, when the user selects `None`, the checkbox `enable AA` is unchecked.
CCBUG: 416140