java completion: don't overwrite whole anonymous class

search for reference at `BaseClassRe|f`, not `BaseClassRef() { ... }.call()`

java/java-tests/testData/codeInsight/completion/className/nameCompletion/java/NestedAnonymousTab-result.java

@@ -0,0 +1,19 @@
+class Bar {
+    void v() {
+        new Runnable() {
+            @Override
+            public void run() {
+                new Foo()<caret> {
+                    @Override
+                    public void run() {
+                    }
+                };
+
+            }
+        }.run();
+    }
+}
+
+class Foo {
+    Foo() {}
+}

java/java-tests/testData/codeInsight/completion/className/nameCompletion/java/NestedAnonymousTab-source.java

@@ -0,0 +1,19 @@
+class Bar {
+    void v() {
+        new Runnable() {
+            @Override
+            public void run() {
+                new Fo<caret>o() {
+                    @Override
+                    public void run() {
+                    }
+                };
+
+            }
+        }.run();
+    }
+}
+
+class Foo {
+    Foo() {}
+}