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Refs #36913 -- Maintained error message determinism in MultipleChoiceField.validate().
Fixed #15667 -- Added template-based widget rendering.
Fixed invalid HTML in test templates.
Refs #33134, Refs #34077 -- Adjusted form rendering recursion test.
Applied Black's 2026 stable style.
Renamed some tests and removed references to modeltests/regressiontests.
Modified tests to format PKs with %s rather than %d.
Refs #33476 -- Reformatted code with Black.