[e4][editor] refactoring produces garbage in fragment.e4xmi

[laeubi]

If I have a class (e.g. in a shared class) in fragment.e4xmi and refactor the classname this results in a wild mixture of old and new name somewhere in the middle.

This seem to happen mostly if more than one reference is in the fragment.e4xmi, e.g. if I have MyPart and a Handler that is an inner class (e.g.MyPart$MyHandler) in a toolbar.