docs: def _draw_inner_connector(context, width, height):
          """Draw the connector for container states
  
          Connector for container states can be connected from the inside and the outside. Thus the connector is split
          in two parts: A rectangle on the inside and an arrow on the outside. This methods draws the inner rectangle.
  
          :param context: Cairo context
          :param float port_size: The side length of the port
          """
          c = context
          # Current pos is center
          # Arrow is drawn upright
  
          gap = height / 6.
          connector_height = (height - gap) / 2.
  
          # First move to bottom left corner
          c.rel_move_to(-width / 2., height / 2.)
  
          # Draw inner connector (rectangle)
          c.rel_line_to(width, 0)
          c.rel_line_to(0, -connector_height)
          c.rel_line_to(-width, 0)
          c.close_path()