Pushing down a method that contains a method call using qualified this may lead
to compilation error: No enclosing instance of the type is accessible in scope 

Steps to Reproduce:
1. Create the classes:
public class A {
  public long m(){
      return A.this.k();
  }
  public long k( ){
    return 1;
  }
}
public class B extends A{}

2. Apply the push down refactoring to A.m():
public class A {
  public long k( ){
    return 1;
  }
}
public class B extends A{
  public long m(){
      return A.this.k();
  }
}

3. After the refactoring, there is a compilation error: No enclosing instance
of the type A is accessible in scope