3.9.90
======

New style for WM buttons to go together with the new headerbar
controls. 

GTK3:
 Improved client side decorations.
 New radiobuttons and checkboxes.
 HIDPI support.
 Unified infobar styling.
 App specific fixes for Contacts, Baobab. (Erick Pérez Castellanos, 
 Stefano Facchini)