convert anonymous to inner: collapse diamonds (IDEA-87265)

java/java-tests/testData/refactoring/anonymousToInner/collapseDiamonds.java

@@ -0,0 +1,14 @@
+public class Foo {
+    public<T> void foo() {
+        Predicate<T> predicate = ne<caret>w Predicate<T>() {
+            @Override
+            public boolean test(T t) {
+                return false;
+            }
+        };
+    }
+
+    private interface Predicate<K> {
+        boolean test(K t);
+    }
+}