code: def setdefaults(self, from_qs):
          
          for k in from_qs.keys():
              from_value = from_qs[k]
              fv_is_qs = isinstance(from_value, QuickSettings)
              self_value = self.get(k, None)
              sv_is_qs = isinstance(self_value, QuickSettings)
              if self_value is None:
                  # we don't have a value, so just take the value of the from
                  # object
                  self[k] = from_value
              elif sv_is_qs and fv_is_qs:
                  self_value.setdefaults(from_value)
docs: sets values from a QuickSettings object, only keeping values that
              are not already defined on the main object