Merge branch 'gh-112087-dict' into nogil-integration

Author: colesbury

Objects/listobject.c

@@ -1374,6 +1374,11 @@ _list_extend(PyListObject *self, PyObject *iterable)
         res = list_extend_set(self, (PySetObject *)iterable);
         Py_END_CRITICAL_SECTION2();
     }
+    else if (PyDict_CheckExact(iterable)) {
+        Py_BEGIN_CRITICAL_SECTION2(self, iterable);
+        res = list_extend_dict(self, (PyDictObject *)iterable, 0 /*keys*/);
+        Py_END_CRITICAL_SECTION2();
+    }
     else if (Py_IS_TYPE(iterable, &PyDictKeys_Type)) {
         PyDictObject *dict = ((_PyDictViewObject *)iterable)->dv_dict;
         Py_BEGIN_CRITICAL_SECTION2(self, dict);