Highlight useless __eq__ for attrs with default cmp parameter (PY-26354)

python/src/com/jetbrains/python/codeInsight/stdlib/PyDataclasses.kt

@@ -101,7 +101,7 @@ private class PyDataclassParametersBuilder(private val type: PyDataclassParamete
   private var init = DEFAULT_INIT
   private var repr = DEFAULT_REPR
   private var eq = DEFAULT_EQ
-  private var order = DEFAULT_ORDER
+  private var order = if (type == PyDataclassParameters.Type.ATTRS) DEFAULT_EQ else DEFAULT_ORDER
   private var unsafeHash = DEFAULT_UNSAFE_HASH
   private var frozen = DEFAULT_FROZEN
 

python/testData/inspections/PyDataclassInspection/attrsUselessInitReprStrEq.py

@@ -46,6 +46,14 @@ class B2:
     def <warning descr="'__init__' is ignored if the class already defines 'init' parameter">__init__</warning>(self):
         print("ok")
 
+
+@attr.dataclass
+class C1:
+    c: int = 1
+
+    def <warning descr="'__eq__' is ignored if the class already defines 'cmp' parameter">__eq__</warning>(self, other):
+        return "eq1"
+
 print(repr(A()))
 print(str(A()))
 print(A() == A())