don't suggest two same-named fields from super classes when one overrides the other

java/java-tests/testData/codeInsight/completion/normal/DoubleConstant.java

@@ -0,0 +1,8 @@
+interface Intf { Intf FOO = null; }
+interface Intf2 extends Intf { Intf2 FOO = null; }
+
+public class Bar implements Intf2 {
+  public static void fpp() {
+    F<caret>
+  }
+}