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Other modules should be able to use the diff utility by calling the API. A diff provider (a service, that retrieves the file differences) and diff presenter (the visual display of these differences) can be defined to be able to plug together an arbitrary diff provider and diff presenter. The module implementation should then define one diff provider (currently it's an external utility, in the future it should be Java native diff) and one diff visual presenter (it will be moved from vcscore module).
Already implemented.
Confirming in development build #200206190100 of NetBeans 3.4.