[issue22986] Improved handling of __class__ assignment

[Nathaniel Smith]

Nathaniel Smith added the comment:

Here's a slightly improved patch spurred by a parenthetical comment of Antoine's on the mailing list :-).

The only change is that it adds a check in subclass_dealloc to correct the reference counting in the weird case that someone converts a HEAPTYPE object into a non-HEAPTYPE object while it is being deallocated.

I should probably also mention that I ran the full test suite against the patched version and everything passed; and with -R 3:2 the only difference is a new reference leak in test_zipfile. I'm guessing this might be spurious, given that AFAIK this test shouldn't be touching __class__ assignment at all? But IDK.

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Added file: http://bugs.python.org/file37347/better-__class__-assignment-v2.patch

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