Font chooser backports
This backports the support for OpenType font features and variations into the font chooser for GTK+3. It bends the api stability a little bit, by introducing 3 new properties:
GtkFontChooser::level GtkFontChooser::font-features GtkFontChooser::language
The reason I am considering it is that the Inkscape team was very interested in using GtkFontChooserWidget over their own, and they need support for OpenType features and variations.
Edited by Matthias Clasen