def insert_row idx, cells=[]
      res = @rows.insert idx, Row.new(self, idx, cells)
      updated_from idx
      res
    end
def insert_row idx, cells=[]
      res = @rows.insert idx, Row.new(self, idx, cells)
      updated_from idx
      res
    end
def insert_row idx , cells = [ ] res = @rows . insert idx , Row . new ( self , idx , cells ) updated_from idx res end
Insert a Row at _idx_ (0-based) containing _cells_
Insert a Row at _idx_ ( 0 - based ) containing _cells_