def has_sel_changed(self):
        return not self.is_equal_to_old_sel(self._view.sel())
Check that the must_revalidate cache control header is set on
dataset/ETHPy150Open guillermooo/Vintageous/vi/core.py/ViCommandMixin.has_sel_changed--crossover with--dataset/ETHPy150Open skibblenybbles/django-daydreamer/daydreamer/tests/views/behaviors/cache/tests.py/CacheControlTestCase.test_must_revalidate