fixed PY-8128 Change Signature: signature for child method is not updated when changing method name

python/src/com/jetbrains/python/refactoring/changeSignature/PyChangeSignatureUsageProcessor.java

@@ -232,8 +232,7 @@ public class PyChangeSignatureUsageProcessor implements ChangeSignatureUsageProc
       updateParameterList(changeInfo, function);
     }
     if (changeInfo.isNameChanged()) {
-      final PsiElement method = changeInfo.getMethod();
-      RenameUtil.doRenameGenericNamedElement(method, changeInfo.getNewName(), UsageInfo.EMPTY_ARRAY, null);
+      RenameUtil.doRenameGenericNamedElement(function, changeInfo.getNewName(), UsageInfo.EMPTY_ARRAY, null);
     }
   }
 

python/testData/refactoring/changeSignature/renameOverriding.after.py

@@ -0,0 +1,8 @@
+class A(object):
+  def m1(self):
+    print(1)
+
+
+class B(A):
+  def m1(self):
+    print(2)

python/testData/refactoring/changeSignature/renameOverriding.before.py

@@ -0,0 +1,8 @@
+class A(object):
+  def m<caret>(self):
+    print(1)
+
+
+class B(A):
+  def m(self):
+    print(2)

python/testSrc/com/jetbrains/python/refactoring/changeSignature/PyChangeSignatureTest.java

@@ -87,6 +87,10 @@ public class PyChangeSignatureTest extends PyTestCase {
                                               new PyParameterInfo(-1, "a", "2", false)), LanguageLevel.PYTHON32);
   }
 
+  public void testRenameOverriding() {
+    doChangeSignatureTest("m1", Arrays.asList(new PyParameterInfo(0, "self", null, false)));
+  }
+
   public void testEmptyParameterName() {
     doValidationTest(null, Arrays.asList(new PyParameterInfo(-1, "", "2", true)),
                      PyBundle.message("refactoring.change.signature.dialog.validation.parameter.name"));