code: def _rebuild_all_command_chains(self):
          
          self._commands_by_name = {}
          for command in self._commands:
              self._build_command_chain(command)
docs: Rebuilds execution chain for all registered commands.
          This method is typically called when intercepters are changed.
          Because of that it is more efficient to register intercepters
          before registering commands (typically it will be done in abstract classes).
          However, that performance penalty will be only once during creation time.