gjc.v6.RetroTransport: public inner classes make use of variable this$0 in generated code

[Burkhard Kuehlert]

Let us assume we have this code:

..
public class Outerclass
{
  public class InnerClass
  {
  }
}

then the gjc.v6.RetroTransport compiler generates the following:

protected void deepCloneReferences(uka.transport.DeepClone _helper)
  throws CloneNotSupportedException
{
  this.this$0 = (com.x.Outerclass) _helper.doDeepClone(this.this$0);
}

This is wrong cause the inner class is independent of outer objects.