protected Size2D arrangeNF(BlockContainer container,Graphics2D g2,RectangleConstraint constraint){
  return arrangeNN(container,g2);
}

protected Size2D arrangeNF ( BlockContainer container , Graphics2D g2 , RectangleConstraint constraint ) { return arrangeNN ( container , g2 ) ; }
arranges the blocks with no width constraint and a fixed height constraint . this puts all blocks into a single row .
