Add a style class to fullscreened windows
Add a style class to fullscreened windows

This will let us tweak stuff that gets shown in fullscreen windows,
https://bugzilla.gnome.org/show_bug.cgi?id=654051

jessevdk/gtk,jadahl/gtk,alexlarsson/gtk,alexlarsson/gtk,Adamovskiy/gtk,ahodesuka/gtk,jessevdk/gtk,jessevdk/gtk,jadahl/gtk,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,davidgumberg/gtk,davidgumberg/gtk,grubersjoe/adwaita,jigpu/gtk,grubersjoe/adwaita,Adamovskiy/gtk,grubersjoe/adwaita,chergert/gtk,Lyude/gtk-,alexlarsson/gtk,chergert/gtk,jigpu/gtk,Adamovskiy/gtk,jigpu/gtk,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,davidgumberg/gtk,jessevdk/gtk,ahodesuka/gtk,Lyude/gtk-,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,Adamovskiy/gtk,alexlarsson/gtk,davidgumberg/gtk,jadahl/gtk,ahodesuka/gtk,jadahl/gtk,alexlarsson/gtk,grubersjoe/adwaita,ahodesuka/gtk,davidgumberg/gtk,grubersjoe/adwaita,jigpu/gtk,Adamovskiy/gtk,ahodesuka/gtk,alexlarsson/gtk,jadahl/gtk,jessevdk/gtk,Lyude/gtk-,jigpu/gtk,chergert/gtk,jessevdk/gtk,Lyude/gtk-,ahodesuka/gtk,davidgumberg/gtk,jessevdk/gtk,ahodesuka/gtk,ahodesuka/gtk,Adamovskiy/gtk,jigpu/gtk,Lyude/gtk-,chergert/gtk,Adamovskiy/gtk,Lyude/gtk-,Lyude/gtk-,jigpu/gtk,chergert/gtk,jadahl/gtk,grubersjoe/adwaita,Lyude/gtk-,jadahl/gtk,chergert/gtk,Adamovskiy/gtk,chergert/gtk