-Dockable::on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>&, Gtk::SelectionData& selection_data, guint info, guint time)
+Dockable::on_drag_data_get(const Glib::RefPtr<Gdk::DragContext>&, Gtk::SelectionData& selection_data, guint /*info*/, guint /*time*/)