New method creation that specifies generic parameter needs to use appropriate generic parameter name

[jjohnstn]

From: https://bugs.eclipse.org/bugs/show_bug.cgi?id=539067

Another related but different problem: if the destination is already generic, the correct type variable is not used.

Before quickfix:

    public class Bug {
        
        private static class Class1<T> {
            T t;
            Class2<T> c2;
            
            void method() {
                c2.useT(t);  // Quickfix "Create method 'useT(T)' in Class2"
            }
        }
    
        private static class Class2<U> {
        }
    }

After quickfix:

    public class Bug {
        
        private static class Class1<T> {
            T t;
            Class2<T> c2;
            
            void method() {
                c2.useT(t);
            }
        }
    
        private static class Class2<U> {
            public void useT(T t) {  // Should be (U t), not (T t)
            }
        }
    }