Improves ordered_box_containers method on ContainerBox.
Improves ordered_box_containers method on ContainerBox.

YACOWS/opps,YACOWS/opps,williamroot/opps,YACOWS/opps,jeanmask/opps,williamroot/opps,williamroot/opps,YACOWS/opps,williamroot/opps,jeanmask/opps,jeanmask/opps,opps/opps,jeanmask/opps,opps/opps,opps/opps,opps/opps