code: function recalculateCellHeights(tableGrid, heights) {
          var allCells = tableGrid.getAllCells();
          return Tools.map(allCells, function (cell) {
            var height = total(cell.rowIndex, cell.rowIndex + cell.rowspan, heights);
            return {
              element: cell.element,
              height: height,
              rowspan: cell.rowspan
            };
          });
        }
docs: Combine cell's css heights to determine heights of rowspan'd cells.