[jdt-ui-dev] Create Change Object which does not show-up in the Preview

["Arun J" <mail.jak@xxxxxxxxx>]

In the LTK refactoring framework is there a way to create a Change Object

which does not show up when previewed but it(perform()) gets called as part
of createChange.  (NullChange shows up in the preview and don't think that
would help)

Usecase is such that it does not make sense to show the user a change on
preview but handle it internally.  (of course  rest of the things such as
Undo should work like for any other change).

Is there any behavior that could be overridden to achieve this if it does
not exist already?
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