docs: def register_from_fields(self, *args):
          """
          Register config name from field widgets
  
          Arguments:
              *args: Fields that contains widget
                  :class:`djangocodemirror.widget.CodeMirrorWidget`.
  
          Returns:
              list: List of registered config names from fields.
          """
          names = []
          for field in args:
              widget = self.resolve_widget(field)
              self.register(widget.config_name)
              if widget.config_name not in names:
                  names.append(widget.config_name)
  
          return names