Fixed #34515 -- Made LocaleMiddleware prefer language from paths when i18n patterns are used.

Regression in 94e7f471c4edef845a4fe5e3160132997b4cca81.

This reverts commit 94e7f471c4edef845a4fe5e3160132997b4cca81
(refs #34069) and
partly reverts commit 3b4728310a7a64f8fcc548163b0aa5f98a5c78f5.

Thanks Anthony Baillard for the report.

Co-Authored-By: Sarah Boyce <42296566+sarahboyce@users.noreply.github.com>

3 files changed, 28 insertions, 17 deletions

diff --git a/tests/i18n/patterns/tests.py b/tests/i18n/patterns/tests.py
index ad7b8ed1d4..df55a1ee13 100644
--- a/tests/i18n/patterns/tests.py
+++ b/tests/i18n/patterns/tests.py
@@ -431,6 +431,27 @@ class URLResponseTests(URLTestCaseBase):
         self.assertEqual(response.context["LANGUAGE_CODE"], "nl")
 
 
+@override_settings(ROOT_URLCONF="i18n.urls_default_unprefixed", LANGUAGE_CODE="nl")
+class URLPrefixedFalseTranslatedTests(URLTestCaseBase):
+    def test_translated_path_unprefixed_language_other_than_accepted_header(self):
+        response = self.client.get("/gebruikers/", headers={"accept-language": "en"})
+        self.assertEqual(response.status_code, 200)
+
+    def test_translated_path_unprefixed_language_other_than_cookie_language(self):
+        self.client.cookies.load({settings.LANGUAGE_COOKIE_NAME: "en"})
+        response = self.client.get("/gebruikers/")
+        self.assertEqual(response.status_code, 200)
+
+    def test_translated_path_prefixed_language_other_than_accepted_header(self):
+        response = self.client.get("/en/users/", headers={"accept-language": "nl"})
+        self.assertEqual(response.status_code, 200)
+
+    def test_translated_path_prefixed_language_other_than_cookie_language(self):
+        self.client.cookies.load({settings.LANGUAGE_COOKIE_NAME: "nl"})
+        response = self.client.get("/en/users/")
+        self.assertEqual(response.status_code, 200)
+
+
 class URLRedirectWithScriptAliasTests(URLTestCaseBase):
     """
     #21579 - LocaleMiddleware should respect the script prefix.
diff --git a/tests/i18n/tests.py b/tests/i18n/tests.py
index 01a729ed7b..d44ddb9f83 100644
--- a/tests/i18n/tests.py
+++ b/tests/i18n/tests.py
@@ -1926,22 +1926,8 @@ class UnprefixedDefaultLanguageTests(SimpleTestCase):
         response = self.client.get("/fr/simple/")
         self.assertEqual(response.content, b"Oui")
 
-    def test_unprefixed_language_with_accept_language(self):
-        """'Accept-Language' is respected."""
-        response = self.client.get("/simple/", headers={"accept-language": "fr"})
-        self.assertRedirects(response, "/fr/simple/")
-
-    def test_unprefixed_language_with_cookie_language(self):
-        """A language set in the cookies is respected."""
-        self.client.cookies.load({settings.LANGUAGE_COOKIE_NAME: "fr"})
-        response = self.client.get("/simple/")
-        self.assertRedirects(response, "/fr/simple/")
-
-    def test_unprefixed_language_with_non_valid_language(self):
-        response = self.client.get("/simple/", headers={"accept-language": "fi"})
-        self.assertEqual(response.content, b"Yes")
-        self.client.cookies.load({settings.LANGUAGE_COOKIE_NAME: "fi"})
-        response = self.client.get("/simple/")
+    def test_unprefixed_language_other_than_accept_language(self):
+        response = self.client.get("/simple/", HTTP_ACCEPT_LANGUAGE="fr")
         self.assertEqual(response.content, b"Yes")
 
     def test_page_with_dash(self):
@@ -2017,7 +2003,10 @@ class CountrySpecificLanguageTests(SimpleTestCase):
 
     def test_get_language_from_request_null(self):
         lang = trans_null.get_language_from_request(None)
-        self.assertEqual(lang, None)
+        self.assertEqual(lang, "en")
+        with override_settings(LANGUAGE_CODE="de"):
+            lang = trans_null.get_language_from_request(None)
+            self.assertEqual(lang, "de")
 
     def test_specific_language_codes(self):
         # issue 11915
diff --git a/tests/i18n/urls_default_unprefixed.py b/tests/i18n/urls_default_unprefixed.py
index f14b059d37..d4ab5a7e1d 100644
--- a/tests/i18n/urls_default_unprefixed.py
+++ b/tests/i18n/urls_default_unprefixed.py
@@ -7,5 +7,6 @@ urlpatterns = i18n_patterns(
     re_path(r"^(?P<arg>[\w-]+)-page", lambda request, **arg: HttpResponse(_("Yes"))),
     path("simple/", lambda r: HttpResponse(_("Yes"))),
     re_path(r"^(.+)/(.+)/$", lambda *args: HttpResponse()),
+    re_path(_(r"^users/$"), lambda *args: HttpResponse(), name="users"),
     prefix_default_language=False,
 )