needsPaintBounds

Whether this decorator needs the component's paint bounds worked out, through paintBounds, while no visible child has an edge past the layout bounds and no decorator has outsets; true by default. A child with an edge past the layout bounds, or a decorator with outsets, has them worked out whatever this answers. Return false only when this decorator, in a box of width by height, cannot enlarge a box-sized content's paint bounds beyond its outsets.