CloneLayouter
Layouter* verticalLayouter = fVerticalLayouter->CloneLayouter();
fHeightForWidthLayouter = fLayouter->CloneLayouter();
clone->fLayouter = fLayouter->CloneLayouter();
virtual Layouter* CloneLayouter();
virtual Layouter* CloneLayouter();
virtual Layouter* CloneLayouter() = 0;
virtual Layouter* CloneLayouter();
virtual Layouter* CloneLayouter();