Fix wrong assumptions in quickfix

Diagnostic is always reported on overriden property

 #EA-64407 Fixed

idea/src/org/jetbrains/kotlin/idea/quickfix/ChangeVariableTypeFix.java

@@ -137,8 +137,8 @@ public class ChangeVariableTypeFix extends JetIntentionAction<JetVariableDeclara
             protected List<IntentionAction> doCreateActions(@NotNull Diagnostic diagnostic) {
                 List<IntentionAction> actions = new LinkedList<IntentionAction>();
 
-                JetProperty property = QuickFixUtil.getParentElementOfType(diagnostic, JetProperty.class);
-                if (property != null) {
+                if (diagnostic.getPsiElement() instanceof JetProperty) {
+                    JetProperty property = (JetProperty) diagnostic.getPsiElement();
                     BindingContext context = ResolvePackage.analyzeFully(property.getContainingJetFile());
                     JetType lowerBoundOfOverriddenPropertiesTypes = QuickFixUtil.findLowerBoundOfOverriddenCallablesReturnTypes(context, property);
 

idea/testData/quickfix/override/typeMismatchOnOverride/namedFunctionReturnOverrideInsideVariableInitializer.kt

@@ -0,0 +1,11 @@
+// "Change 'foo' function return type to 'Boolean'" "true"
+
+interface A {
+    fun foo(): Boolean
+}
+
+fun foo() {
+    val x = object : A {
+        override fun foo(): Boolean?<caret> = true
+    }
+}

idea/testData/quickfix/override/typeMismatchOnOverride/namedFunctionReturnOverrideInsideVariableInitializer.kt.after

@@ -0,0 +1,11 @@
+// "Change 'foo' function return type to 'Boolean'" "true"
+
+interface A {
+    fun foo(): Boolean
+}
+
+fun foo() {
+    val x = object : A {
+        override fun foo(): Boolean = true
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/quickfix/QuickFixTestGenerated.java

@@ -4769,6 +4769,12 @@ public class QuickFixTestGenerated extends AbstractQuickFixTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("namedFunctionReturnOverrideInsideVariableInitializer.kt")
+            public void testNamedFunctionReturnOverrideInsideVariableInitializer() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/override/typeMismatchOnOverride/namedFunctionReturnOverrideInsideVariableInitializer.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("objectInsideBody.kt")
             public void testObjectInsideBody() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("idea/testData/quickfix/override/typeMismatchOnOverride/objectInsideBody.kt");