1.16 regression: `--warn-unused-ignore` now complains in ignored-but-correct places

this appears to have changed behaviour in mypy 1.15 -- I personally prefer the behaviour in 1.15 but would understand if it needed to change. I don't see it mentioned in the changelog however

Bug Report

we're working on incrementally typing a large codebase -- often this means fixing a particular callsite or file at a time (sometimes by intentionally ignoring errors unfortunately)

it seems that in a module with a particular error code (temporarily) disabled, --warn-unused-ignores will complain about a "correct" type ignore (I say "correct" here as it will complain when the file is no longer blocklisted) -- will provide a small example below

To Reproduce

# t.py
def f() -> None:
    x: int = 'hi'  # type: ignore[assignment]

[mypy]
warn_unused_ignores = true
[mypy-t]
disable_error_code = assignment

Expected Behavior

$ mypy --version
mypy 1.15.0 (compiled: yes)
$ mypy t.py
Success: no issues found in 1 source file

Actual Behavior

$ mypy --version
mypy 1.16.0 (compiled: yes)
$ mypy t.py
t.py:2: error: Unused "type: ignore" comment  [unused-ignore]
Found 1 error in 1 file (checked 1 source file)

Your Environment

• Mypy version used: 1.16.0 (regression from 1.15.0)
• Mypy command-line flags: (see above)
• Mypy configuration options from mypy.ini (and other config files): (see above)
• Python version used: 3.13.1

Commencez par reproduire le problème avec le fichier t.py présenté et la configuration de mypy, en comparant le comportement de 1.15.0 et 1.16.0. Localisez ensuite l’implémentation ou les tests de warn_unused_ignores et per-module disable_error_code. Le travail est terminé lorsque l’affectation ignorée n’est pas signalée comme inutilisée lorsque ce code d’erreur est désactivé, avec une couverture de régression.