[1.11.x] Fixed #27815 -- Made LoginView pass the request kwarg to AuthenticationForm.

Backport of 41ba27fefd from master

django/contrib/auth/views.py

@@ -107,6 +107,11 @@ class LoginView(SuccessURLAllowedHostsMixin, FormView):
     def get_form_class(self):
         return self.authentication_form or self.form_class
 
+    def get_form_kwargs(self):
+        kwargs = super(LoginView, self).get_form_kwargs()
+        kwargs['request'] = self.request
+        return kwargs
+
     def form_valid(self, form):
         """Security check complete. Log the user in."""
         auth_login(self.request, form.get_user())

tests/auth_tests/test_views.py

@@ -598,13 +598,14 @@ class LoginTest(AuthViewsTestCase):
         self.assertEqual(response.url, settings.LOGIN_REDIRECT_URL)
 
     def test_login_form_contains_request(self):
-        # 15198
-        self.client.post('/custom_requestauth_login/', {
+        # The custom authentication form for this login requires a request to
+        # initialize it.
+        response = self.client.post('/custom_request_auth_login/', {
             'username': 'testclient',
             'password': 'password',
-        }, follow=True)
-        # the custom authentication form used by this login asserts
-        # that a request is passed to the form successfully.
+        })
+        # The login was successful.
+        self.assertRedirects(response, settings.LOGIN_REDIRECT_URL, fetch_redirect_response=False)
 
     def test_login_csrf_rotate(self):
         """