Setter for **self.__margin_area_LinesNumbers_widget** attribute.

        :param value: Attribute value.
        :type value: LinesNumbers_QWidget

def margin_area_LinesNumbers_widget(self, value):
        """
        Setter for **self.__margin_area_LinesNumbers_widget** attribute.

        :param value: Attribute value.
        :type value: LinesNumbers_QWidget
        """

        if value is not None:
            assert type(value) is LinesNumbers_QWidget, \
                "'{0}' attribute: '{1}' type is not 'LinesNumbers_QWidget'!".format("checked", value)
        self.__margin_area_LinesNumbers_widget = value