code: def is_fold_trigger(block):
          
          if block is None:
              return False
          state = block.userState()
          if state == -1:
              state = 0
          return bool(state & 0x04000000)
docs: Checks if the block is a fold trigger.
  
          :param block: block to check
          :return: True if the block is a fold trigger (represented as a node in
              the fold panel)