skip inaccessible duplicates (IDEA-75520)

java/java-impl/src/com/intellij/refactoring/util/duplicates/DuplicatesFinder.java

@@ -583,7 +583,7 @@ public class DuplicatesFinder {
           }
         }
 
-        if (class2 != null) {
+        if (class2 != null && PsiUtil.isAccessible(method1, class2, null)) {
           final PsiMethod[] methods = class2.getAllMethods();
           if (ArrayUtil.find(methods, method1) != -1) return true;
         }

java/java-tests/testData/refactoring/methodDuplicatesMisc/SkipNotAccessible.java

@@ -0,0 +1,18 @@
+class B {
+    private void <caret>g() {
+           f();
+       }
+
+       private void f() {
+       }
+}
+
+
+class C extends B {
+    private void g() {
+        f();
+    }
+
+    private void f() {
+    }
+}

java/java-tests/testSrc/com/intellij/refactoring/FindMethodDuplicatesMiscTest.java

@@ -85,4 +85,8 @@ public class FindMethodDuplicatesMiscTest extends FindMethodDuplicatesBaseTest {
   public void testVarVarargsAccess() throws Exception {
     doTest();
   }
+
+  public void testSkipNotAccessible() throws Exception {
+    doTest(false);
+  }
 }