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They're quite useful outside of the view environment.
I don't think I understand what you mean - are the content providers not always used with a viewer? Or do you mean something else with 'view environment'?
Yes I meant the former, that they are useful without actually doing graph visualization. But OTOH, I realized that IContentProvider and so on are actually part of jface, so I can see that it makes sense to have their analogs in zest.jface.