sort langtool add-ons before groupby (bug 578826)

apps/browse/tests.py

@@ -64,7 +64,7 @@ class TestLanguageTools(amo.test_utils.ExtraSetup, test_utils.TestCase):
     def test_packs_and_dicts(self):
         ca = dict(self.locales)['ca-valencia']
         eq_(len(ca.dicts), 1)
-        eq_(len(ca.packs), 2)
+        eq_(len(ca.packs), 3)
 
     def test_empty_target_locale(self):
         """Make sure nothing breaks with empty target locales."""

apps/browse/views.py

@@ -70,7 +70,7 @@ def _get_locales(addons):
                 'locale_disambiguation': addon.locale_disambiguation}
 
     locales = {}
-    for locale, addons in itertools.groupby(addons, lambda x: x.target_locale):
+    for locale, addons in amo.utils.sorted_groupby(addons, 'target_locale'):
         addons = list(addons)
         dicts = [slim(a) for a in addons if a.type == amo.ADDON_DICT]
         packs = [slim(a) for a in addons if a.type == amo.ADDON_LPAPP]