PEP-681 - Inheriting class doesn't recognize kw_only=True from parent class

Bug Report

A class inheriting a class with kw_only=True and using a dataclass_transform doesn't recognize kw_only being set, even though in runtime it does not yield an error. Originally found in sqlalchemy's usage (https://github.com/sqlalchemy/sqlalchemy/issues/11485)

To Reproduce

from typing import Optional, Any
import typing_extensions


def field(default: Any=None, init: bool=True, repr: bool=True) -> Any:
    pass

@typing_extensions.dataclass_transform(
    field_specifiers=(
        field,
    )
)
class ModelMeta(type):
    pass

class ModelBase(metaclass=ModelMeta):
    def __init_subclass__(cls, kw_only: bool=False) -> None:
        pass

class Base(ModelBase, kw_only=True):
    pass

class Vehicle(Base):
    b: Optional[str] = field(default=None)
    c: int

Expected Behavior

No error.

Actual Behavior

error: Attributes without a default cannot follow attributes with one  [misc]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.10
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.12

Commencez par le reproducer minimal en Python présent dans l'issue et suivez la gestion par mypy de dataclass_transform de PEP 681 pour les paramètres kw_only hérités. Comparez l'erreur d'ordre signalée au comportement attendu, puis ajoutez un test de régression pour ce reproducer et exécutez la suite de tests pertinente afin de confirmer qu'aucune erreur n'est signalée.