`numpydoc ignore` inline comment not recognized when using decorators

[sdiebolt]

When using decorators, the numpydoc ignore inline comment does not seem to be recognized by either numpydoc --validate or the validation during Sphinx build. Here's a reprex, stored as test.py:

import functools


def test_decorator(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs)

    return wrapper


@test_decorator
def test_function():  # numpydoc ignore=PR02
    """Test.

    Parameters
    ----------
    x : int
        Test.
    """
    print("test")

Using python -m numpydoc --validate test.test_function raises the warning test.test_function:PR02:Unknown parameters {'x'} when the decorator is used, but doesn't when the decorator is removed. Same thing when using validation during a Sphinx build. Interestingly, validation using python -m numpydoc.hooks.validate_docstrings test.py does not raise the PR02 warning, even when using the decorator.

[sdiebolt]

#496 fixes this for all but @property decorated methods. I'll open a follow-up PR to handle these.

[sdiebolt]

#500 will allow the validator to handle properties (@property and @cached_property). Note however that custom decorators that don't make use of @functools.wraps or return anything other than the function itself will not be handled by the validator.