Returns 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.
the cell area used by cell_layout
Returns 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.