change method return type: avoid changes in hierarchy when assignable (IDEA-209931)

GitOrigin-RevId: 43166bdd806d2a0b6ed2e72e6630c9cf53fba7b4

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/methodReturn/afterUntouchedHierarchy.java

@@ -0,0 +1,25 @@
+// "Make 'b' return 'java.lang.Integer'" "true"
+
+class MyClass {
+    interface BaseInterface {
+
+        Object b();
+    }
+
+    class BooleanImpl implements BaseInterface {
+
+        @Override
+        public Boolean b() {
+            return true;
+        }
+    }
+
+
+    class IntegerImpl implements BaseInterface {
+
+        @Override
+        public Integer b() {
+            return 1;
+        }
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/methodReturn/beforeUntouchedHierarchy.java

@@ -0,0 +1,25 @@
+// "Make 'b' return 'java.lang.Integer'" "true"
+
+class MyClass {
+    interface BaseInterface {
+
+        Object b();
+    }
+
+    class BooleanImpl implements BaseInterface {
+
+        @Override
+        public Boolean b() {
+            return true;
+        }
+    }
+
+
+    class IntegerImpl implements BaseInterface {
+
+        @Override
+        public String b() {
+            return <caret>1;
+        }
+    }
+}