gdk_window_end_paint: Flush destination surface after paint
gdk_window_end_paint: Flush destination surface after paint

It seems in cairo 1.14 we need this after having painted an image surface
to a X11 window surface (i.e. with GDK_RENDERING=image).

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