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bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864)

(cherry picked from commit ca2009d72a52a98bf43aafa9ad270a4fcfabfc89)

Co-authored-by: Brandt Bucher <brandt@python.org>
M
Miss Islington (bot) committed
88970125e7a4917966f711dc7e93cf170977034f
Parent: 8bec9fb
Committed by GitHub <noreply@github.com> on 6/25/2021, 3:46:23 PM