<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def discard_plugin_preset(self):
 """ Discard the current active preset. Will release any active plugins that could have come from the old preset. """

        if self.has_plugin_preset:
            for name, plugin in list(self._active_plugins.items()):
                if id(plugin) in self._provided_by_preset:
                    self.release_plugin(name)
            self._active_preset.deactivate(self)
        self._active_preset = None