Get the underlying gtk.cell_area.CellArea which might be cell_layout if called on a gtk.cell_area.CellArea or might be NULL if no gtk.cell_area.CellArea is used by cell_layout.
Get the underlying gtk.cell_area.CellArea which might be cell_layout if called on a gtk.cell_area.CellArea or might be NULL if no gtk.cell_area.CellArea is used by cell_layout.