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This also prevents state modifications from corrupting previous states.
Previously, when a model defining a relation was unregistered first,
clearing the cache would cause its related models' _meta to be cleared
and would result in the old models losing track of their relations.
Backport of
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| .. | ||
| faulty_migrations | ||
| migrations_test_apps | ||
| related_models_app | ||
| test_migrations | ||
| test_migrations_backwards_deps_1 | ||
| test_migrations_conflict | ||
| test_migrations_custom_user | ||
| test_migrations_empty | ||
| test_migrations_first | ||
| test_migrations_no_ancestor | ||
| test_migrations_no_changes | ||
| test_migrations_no_default | ||
| test_migrations_run_before | ||
| test_migrations_squashed | ||
| test_migrations_squashed_complex | ||
| test_migrations_squashed_complex_multi_apps | ||
| test_migrations_squashed_erroneous | ||
| test_migrations_unmigdep | ||
| __init__.py | ||
| models.py | ||
| test_autodetector.py | ||
| test_base.py | ||
| test_commands.py | ||
| test_executor.py | ||
| test_graph.py | ||
| test_loader.py | ||
| test_multidb.py | ||
| test_operations.py | ||
| test_optimizer.py | ||
| test_state.py | ||
| test_writer.py | ||