docs: def create_key_manager(self):
          """Create the :class:`KeyManager`.
  
          The inputs to KeyManager are expected to be callable, so we can't
          use the standard @property and @attrib.setter for these attributes.
          Lambdas cannot contain assignments so we're forced to define setters.
  
          :rtype: :class:`KeyManager`
          :return: A KeyManager with callables to set the toolbar options.  Also
              includes the method stop_input_and_refresh_cli to ensure certain
              options take effect within the current session.
  
          """
          def set_match_fuzzy(match_fuzzy):
              """Setter for fuzzy matching mode.
  
              :type match_fuzzy: bool
              :param match_fuzzy: The match fuzzy flag.
  
              """
              self.model_completer.match_fuzzy = match_fuzzy
  
          def set_enable_vi_bindings(enable_vi_bindings):
              """Setter for vi mode keybindings.
  
              If vi mode is off, emacs mode is enabled by default by
              `prompt_toolkit`.
  
              :type enable_vi_bindings: bool
              :param enable_vi_bindings: The enable Vi bindings flag.
  
              """
              self.enable_vi_bindings = enable_vi_bindings
  
          def set_show_completion_columns(show_completion_columns):
              """Setter for showing the completions in columns flag.
  
              :type show_completion_columns: bool
              :param show_completion_columns: The show completions in
                  multiple columns flag.
  
              """
              self.show_completion_columns = show_completion_columns
  
          def set_show_help(show_help):
              """Setter for showing the help container flag.
  
              :type show_help: bool
              :param show_help: The show help flag.
  
              """
              self.show_help = show_help
  
          return KeyManager(
              lambda: self.model_completer.match_fuzzy, set_match_fuzzy,
              lambda: self.enable_vi_bindings, set_enable_vi_bindings,
              lambda: self.show_completion_columns, set_show_completion_columns,
              lambda: self.show_help, set_show_help,
              self.stop_input_and_refresh_cli)