docs: def add_row(self):
          """
          Return a |_Row| instance, newly added bottom-most to the table.
          """
          tbl = self._tbl
          tr = tbl.add_tr()
          for gridCol in tbl.tblGrid.gridCol_lst:
              tc = tr.add_tc()
              tc.width = gridCol.w
          return _Row(tr, self)