fix: Fix unexpected ordering after values()/values_list() followed by order_by().

Refs #655
Refs #656

Author: mick88

modeltranslation/manager.py

@@ -180,7 +180,7 @@ def __init__(self, *args, **kwargs):
     def _post_init(self):
         self._rewrite = True
         self._populate = None
-        if self.model and (not self.query.order_by):
+        if self.model and self.query.default_ordering and (not self.query.order_by):
             if self.model._meta.ordering:
                 # If we have default ordering specified on the model, set it now so that
                 # it can be rewritten. Otherwise sql.compiler will grab it directly from _meta

modeltranslation/tests/tests.py

@@ -2546,6 +2546,13 @@ def test_order_by_meta(self):
         assert titles_for_en == ('most', 'more_en', 'more_de', 'least')
         assert titles_for_de == ('most', 'more_de', 'more_en', 'least')
 
+    def test_order_by_reset(self):
+        qs = models.ManagerTestModel.objects.all()
+        assert qs.ordered
+        assert not qs.order_by().ordered
+        assert not qs.values('title').order_by().ordered
+        assert not qs.order_by().values('title').ordered, "queryset is unexpectedly ordered"
+
     def test_latest(self):
         manager = models.ManagerTestModel.objects
         manager.create(title='more_de', visits_en=1, visits_de=2)