The test case below describes a problem where the method propagation causes a
class and the interface it implements get out of synch.

The problem may be reproduced by performing the following steps:
1. Create a java class
2. create an interface containing public void a(int i);
3. Make the class created in 1 implement the interface from step 2
4. say perform all changes without prompt during the dialog
5. copy and paste the method in the interface, there should be two identical
methods. Wait until the two methods show up in the explorer
6. Change the last method added to be public void a(String i);
7. The interface and the class are now out of synch the class has the method
changed from public void a(int i) to public void a(String i), so there is only
one method in the class instead of two.

If another method say public void b() is added the class will add the new
method.