Comment 3 for bug 1492252

This poses a challenge, because shell needs to pass the complete copy of the activated result with preview request. When preview is requested by the user via the UI, the shell naturally has the result in question and can pass it. But to make this work via a canned query, we would need to serialize entire result in the canned query, so that the query can be invoked from any context of the UI. While this is doable, I think it will be very fragile and hard for apps to get right (even a subtle change in preview handling internals of the scope may break canned queries created for it by external apps).