fixtures: remove no longer needed special case in pytest_generate_tests

Originally added in c00fe96, but since
made redundant.

The `ignore_args` parameter in `getfixtureclosure()` (populated by
`_get_direct_parametrize_args()`) now handles the precedence
automatically. When a test directly parametrizes an argument, it's
included in `ignore_args`, which prevents the fixture from being
included in the closure computation in the first place.

Author: bluetech

src/_pytest/fixtures.py

@@ -56,7 +56,6 @@
 from _pytest.deprecated import MARKED_FIXTURE
 from _pytest.deprecated import YIELD_FIXTURE
 from _pytest.main import Session
-from _pytest.mark import Mark
 from _pytest.mark import ParameterSet
 from _pytest.mark.structures import MarkDecorator
 from _pytest.outcomes import fail
@@ -1695,11 +1694,6 @@ def sort_by_scope(arg_name: str) -> Scope:
 
     def pytest_generate_tests(self, metafunc: Metafunc) -> None:
         """Generate new tests based on parametrized fixtures used by the given metafunc"""
-
-        def get_parametrize_mark_argnames(mark: Mark) -> Sequence[str]:
-            args, _ = ParameterSet._parse_parametrize_args(*mark.args, **mark.kwargs)
-            return args
-
         for argname in metafunc.fixturenames:
             # Get the FixtureDefs for the argname.
             fixture_defs = metafunc._arg2fixturedefs.get(argname)
@@ -1708,14 +1702,6 @@ def get_parametrize_mark_argnames(mark: Mark) -> Sequence[str]:
                 # else (e.g @pytest.mark.parametrize)
                 continue
 
-            # If the test itself parametrizes using this argname, give it
-            # precedence.
-            if any(
-                argname in get_parametrize_mark_argnames(mark)
-                for mark in metafunc.definition.iter_markers("parametrize")
-            ):
-                continue
-
             # In the common case we only look at the fixture def with the
             # closest scope (last in the list). But if the fixture overrides
             # another fixture, while requesting the super fixture, keep going