[pull] main from django:main - #534
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This avoids the need to add `@skipUnlessGISLookup("contained")` while
modeling equally realistic usage.
Support for database-level delete options removed "on_delete" from `Field.non_db_attrs` because changes to or from the new `DB_CASCADE`, `DB_SET_DEFAULT`, and `DB_SET_NULL` options require schema changes. As a consequence, an `AlterField` changing only a Python-level `on_delete` option (such as `CASCADE` to `PROTECT`) performs unnecessary schema changes when it was previously a no-op at the database level. This commit makes `ForeignObject.non_db_attrs` a property that includes `"on_delete"`only when the option is not a database-level one, so that: - Python-level to Python-level changes skip DDL again, - changes to, from, or between database-level options still alter the field. Regression in 0c487aa.
co-authored-by: David Smith <smithdc@gmail.com>
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