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@forteller That doesn't make intuitive sense to me, and I'm not sure the widget toolkits people are going to think it makes sense either.

The background apps API is not a direct "do this specific graphical widget" kind of thing, it's an "operating system behavior" API.
It is the same to me than inhibiting screenlock or suspend (it does not involve a GUI toolkit) or emitting desktop notifications (you don't ask a widgets GUI toolkit to do it for you, you just do it)—the behavior is up to the DE.