code: def move_sibling_next(self):
          
          cursor = self.nav.absolute_index
          if cursor >= 0:
              level = self.content.get(cursor)['level']
              try:
                  move = 1
                  while self.content.get(cursor + move)['level'] > level:
                      move += 1
              except IndexError:
                  self.term.flash()
              else:
                  if self.content.get(cursor + move)['level'] == level:
                      for _ in range(move):
                          self._move_cursor(1)
                  else:
                      self.term.flash()
          else:
              self.term.flash()
  
          self.clear_input_queue()
docs: Jump to the next comment that's at the same level as the selected
          comment and shares the same parent.