protected List<PsiClass> getTargetClasses() {
    final GrReferenceExpression ref = getRefExpr();
    final PsiClass targetClass = QuickfixUtil.findTargetClass(ref);
    if (targetClass == null || !canBeTargetClass(targetClass)) return Collections.emptyList();

    final ArrayList<PsiClass> classes = new ArrayList<>();
    collectSupers(targetClass, classes);
    return classes;
  }
protected List<PsiClass> getTargetClasses()