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Changes between Initial Version and Version 2 of Ticket #31123

-              initial
+              v2
 remove_stale_contenttypes only removes stale content types for stale models in installed apps. It doesn't remove stale content types whose app was either removed or renamed.
+Add an option (disabled by default) to `remove_stale_contenttypes` command to remove entries also for nonexistent apps.
+Test:
+Comment out the line that limits the available apps.
+# Speed up tests by avoiding retrieving ContentTypes for all test apps.
+# available_apps = ['contenttypes_tests', 'no_models', 'django.contrib.contenttypes']
+def test_contenttypes_removed_for_apps_not_in_installed_apps(self):
+        ContentType.objects.create(app_label='stale_app', model='Fake')
+        with mock.patch('builtins.input', return_value='yes'), captured_stdout() as stdout:
+            call_command('remove_stale_contenttypes', verbosity=2)
+        self.assertIn("Deleting stale content type 'stale_app | Fake'", stdout.getvalue())
+        self.assertEqual(ContentType.objects.count(), self.before_count)
+Based on [https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!topic/django-developers/0WrbU_Kc2Z0 discussion].