renderScrollingContent property
      
      RenderLayoutBox?
      get
      renderScrollingContent
      
    
    
    
Implementation
RenderLayoutBox? get renderScrollingContent {
  if (firstChild is RenderLayoutBox) {
    RenderLayoutBox _firstChild = firstChild as RenderLayoutBox;
    if (_firstChild.isScrollingContentBox) {
      return _firstChild;
    }
  }
  return null;
}