code: def display_completions_like_readline(event):
      
      # Request completions.
      b = event.current_buffer
      if b.completer is None:
          return
      complete_event = CompleteEvent(completion_requested=True)
      completions = list(b.completer.get_completions(b.document, complete_event))
  
      # Calculate the common suffix.
      common_suffix = get_common_complete_suffix(b.document, completions)
  
      # One completion: insert it.
      if len(completions) == 1:
          b.delete_before_cursor(-completions[0].start_position)
          b.insert_text(completions[0].text)
      # Multiple completions with common part.
      elif common_suffix:
          b.insert_text(common_suffix)
      # Otherwise: display all completions.
      elif completions:
          _display_completions_like_readline(event.cli, completions)
docs: Key binding handler for readline-style tab completion.
      This is meant to be as similar as possible to the way how readline displays
      completions.
  
      Generate the completions immediately (blocking) and display them above the
      prompt in columns.
  
      Usage::
  
          # Call this handler when 'Tab' has been pressed.
          registry.add_binding(Keys.ControlI)(display_completions_like_readline)