Make GtkSeparatorToolItem work for window-dragging again
Make GtkSeparatorToolItem work for window-dragging again

This broke recently when the window dragging code was changed
to require motion events to be propagated as well.

https://bugzilla.gnome.org/show_bug.cgi?id=724539

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