PY-30190 Report unresolved class attributes in decorated classes

Previously, unresolved class attributes were not reported for the decorated classes because of potential dynamical attributes (see PY-7173). This commit enables this warning again because false-negative unresolved reference warning is much more common and distracting than the case with dynamic attributes

Merge-request: IJ-MR-105254
Merged-by: Daniil Kalinin <Daniil.Kalinin@jetbrains.com>

GitOrigin-RevId: 67d1ab3fe1d5a140836d49f8ef6a65cf01873456

python/python-psi-impl/src/com/jetbrains/python/inspections/unresolvedReference/PyUnresolvedReferencesVisitor.java

@@ -486,9 +486,6 @@ public abstract class PyUnresolvedReferencesVisitor extends PyInspectionVisitor
       }
     }
     else {
-      if (PyKnownDecoratorUtil.hasUnknownDecorator(cls, myTypeEvalContext)) {
-        return true;
-      }
       final String docString = cls.getDocStringValue();
       if (docString != null && docString.contains("@DynamicAttrs")) {
         return true;

python/testData/inspections/PyUnresolvedReferencesInspection/decoratedClass.py

@@ -20,4 +20,4 @@ print(c.bar, c.baz, c.quux)
 print(c.<warning descr="Unresolved attribute reference 'spam' for class 'C'">spam</warning>) #fail
 d = D()
 print(d.foo)
-print(d.eggs) #pass
+print(d.<warning descr="Unresolved attribute reference 'eggs' for class 'D'">eggs</warning>)

python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java

@@ -861,6 +861,23 @@ public class PyUnresolvedReferencesInspectionTest extends PyInspectionTestCase {
                  "a.<warning descr=\"Cannot find reference 'append' in 'None'\">append</warning>(10)");
   }
 
+  // PY-30190
+  public void testUnresolvedReferenceInDecoratedClass() {
+    runWithLanguageLevel(
+      LanguageLevel.getLatest(),
+      () -> doTestByText("""
+       def foo(cls):
+           return cls
+                                  
+                                  
+       @foo
+       class Bar2(object):
+           def __init__(self):
+               print(self.<warning descr="Unresolved attribute reference 'hello' for class 'Bar2'">hello</warning>)
+                           """)
+    );
+  }
+
   // PY-39682
   public void testWildcardIgnorePatternReferenceForNestedBinaryModule() {
     runWithAdditionalClassEntryInSdkRoots(getTestDirectoryPath() + "/site-packages", () -> {