One major internal change in GTK3 is the way that themes are designed. GTK2 allowed themes to be implemented with a special format in a gtkrc file, but GTK3 now requires that themes are implemented using CSS. Therefore another non-trivial prerequisite for a GTK3-based sugar release of any visual component is the porting of the theme. | One major internal change in GTK3 is the way that themes are designed. GTK2 allowed themes to be implemented with a special format in a gtkrc file, but GTK3 now requires that themes are implemented using CSS. Therefore another non-trivial prerequisite for a GTK3-based sugar release of any visual component is the porting of the theme. |