docs: function recoverCellIndex(rowIndex, cellIndex) {
              if (!_virtualTable[rowIndex]) {
                  return cellIndex;
              }
              if (!_virtualTable[rowIndex][cellIndex]) {
                  return cellIndex;
              }
  
              var newCellIndex = cellIndex;
              while (_virtualTable[rowIndex][newCellIndex]) {
                  newCellIndex++;
                  if (!_virtualTable[rowIndex][newCellIndex]) {
                      return newCellIndex;
                  }
              }
          }