N805 False positive for class Meta(type(base))

[randolf-scholz]

from typing import Protocol

class MyMeta(type):
    def __subclasscheck__(cls, other): ...  # ✅

class MyProtocolMeta(type(Protocol)):
    def __subclasscheck__(cls, other): ...  # ❌

https://play.ruff.rs/5573b0e2-fba5-47c1-bc69-a7e780324a86

[randolf-scholz]

Problem is with this function, which does not correctly recognizes metaclass in this case:

ruff/crates/ruff_python_semantic/src/analyze/class.rs

Lines 115 to 122 in df7345e

	pub fn is_metaclass(class_def: &ast::StmtClassDef, semantic: &SemanticModel) -> bool {
	any_qualified_name(class_def, semantic, &|qualified_name| {
	matches!(
	qualified_name.segments(),
	["" | "builtins", "type"] | ["abc", "ABCMeta"] | ["enum", "EnumMeta" | "EnumType"]
	)
	})
	}