http://blogs.gnome.org/mclasen/2014/07/28/a-talk-in-9-images/
The main take-away here should be that in 3.14, all GTK+ dialogs will again have traditional decorations if that is what works best in the environment it is used in.
Ъ: ВОТ ТАКЕННЫЕ КНОПИЩА теперь могут перезжать с верхней панели обратно вниз.