GTK+ refactoring to make possible GTK+ 3

by Javier Jardón for GNOME

The idea of GTK+3 is around since 2007 (when GTK+ 2.12 was released). We have GTK+ 2.20 now and seems that there'll be another GTK+ 2.x release. It's time to change this and help to make GTK+3 (finally) possible.