code: def _show_input_processor_key_buffer(self, cli, new_screen):
          
          key_buffer = cli.input_processor.key_buffer
  
          if key_buffer and _in_insert_mode(cli) and not cli.is_done:
              # The textual data for the given key. (Can be a VT100 escape
              # sequence.)
              data = key_buffer[-1].data
  
              # Display only if this is a 1 cell width character.
              if get_cwidth(data) == 1:
                  cpos = new_screen.cursor_position
                  new_screen.data_buffer[cpos.y][cpos.x] = \
                      _CHAR_CACHE[data, Token.PartialKeyBinding]
docs: When the user is typing a key binding that consists of several keys,
          display the last pressed key if the user is in insert mode and the key
          is meaningful to be displayed.
          E.g. Some people want to bind 'jj' to escape in Vi insert mode. But the
               first 'j' needs to be displayed in order to get some feedback.