Product Version = NetBeans IDE 8.0.2 (Build 201411181905)
Operating System = Windows 7 version 6.1 running on amd64
Java; VM; Vendor = 1.8.0_11
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.11-b03

Test class:
public class Image {
 Optional<Image> parent;
  Image(Optional<Image> parent) {
    this.parent = parent;
  }
}

Refractor test class to Add a argument to the constructor of the above class, before presing review of refractor, look at the example method signature, it shows some kind of picture (?!)

Screenshot: https://www.dropbox.com/s/ke5ud3q7p18v7tg/Schermafdruk%202015-11-17%2013.06.24.png?dl=0