docs: def make_room(self, tree):
          """Clear lines in terminal below current cursor position as required
  
          This is important to do before drawing to ensure sufficient
          room at the bottom of your terminal.
  
          :type  tree: dict
          :param tree: tree as described in ``BarDescriptor``
          """
          lines_req = self.lines_required(tree)
          self.cursor.clear_lines(lines_req)