inherit unrelated abstract/default through hierarchy: don't merge methods with not override equivalent signatures (IDEA-146135)

java/java-tests/testSrc/com/intellij/codeInsight/daemon/lambda/Interface8MethodsHighlightingTest.java

@@ -93,6 +93,10 @@ public class Interface8MethodsHighlightingTest extends LightCodeInsightFixtureTe
     doTest();
   }
 
+  public void testSubsignatureCheckWhen2DifferentMethodsBecomeOverrideEquivalent() throws Exception {
+    doTest();
+  }
+
   private void doTest() {
     doTest(false, false);
   }