Let %autoreload work on modules with frozen dataclasses

hhoppe · Carreau · commit becb905f043c · 2022-08-17T10:33:36.000+02:00
See Issue #12411 and Issue #12185. The problem is that a frozen `dataclasses.dataclass` overrides the `__setattr__()` method, so updating its `__class__` member requires going through the base `object` class. This seems to fix the problem.
diff --git a/IPython/extensions/autoreload.py b/IPython/extensions/autoreload.py
@@ -300,7 +300,7 @@ class definition and update their __class__ to point to the new class
 
     for ref in refs:
         if type(ref) is old:
-            ref.__class__ = new
+            object.__setattr__(ref, "__class__", new)
 
 
 def update_class(old, new):
