docs: protected void renderColgroupsFacet(FacesContext facesContext, ResponseWriter writer, UIComponent component)
              throws IOException
      {
          UIComponent colgroupsFacet = component.getFacet("colgroups");
          if (colgroupsFacet == null)
          {
              // no facet to be rendered
              return;
          }
          // render the facet
          //RendererUtils.renderChild(facesContext, colgroupsFacet);
          colgroupsFacet.encodeAll(facesContext);
      }