extract method: use target class context to check nullability

java/java-tests/testData/refactoring/extractMethod/InferredNotNull_after.java

@@ -0,0 +1,19 @@
+import org.jetbrains.annotations.NotNull;
+
+class X {
+  public static String main(String[] args) {
+      return newMethod();
+    
+  }
+
+    @NotNull
+    private static String newMethod() {
+        System.out.println();
+        return f();
+    }
+
+    @NotNull
+  String f() {
+    return "";
+  }
+}