docs: def lines_required(self, tree, count=0):
          """Calculate number of lines required to draw ``tree``"""
          if all([
              isinstance(tree, dict),
              type(tree) != BarDescriptor
          ]):
              return sum(self.lines_required(v, count=count)
                         for v in tree.values()) + 2
          elif isinstance(tree, BarDescriptor):
              if tree.get("kwargs", {}).get("title_pos") in ["left", "right"]:
                  return 1
              else:
                  return 2