Move toward setUpdatePHIDs(...) in all cases, with setUpdatePHIDs(array(the-object-we-just-edited)) as a special case of that. After this change, callers pass:
- An optional list of PHIDs they know need to be updated on the client. Today, this is always be a card we just edited (on edit/move flows), or a sort of made-up list of PHIDs for the moment (when you press "R"). In the future, the "R" endpoint will do a better job of figuring out a more realistic update set.
- An optional list of PHIDs currently visible on the client. This is used to update ordering details and mark cards for removal. This is currently passed by edit/move, but not by pressing "R" (it will be in the future).
- An optional list of objects. The "R" workflow has to load these anyway, so we can save a couple queries by letting callers pass them. For now, the edit/move flows still rely on the engine to figure out what it needs to load.
This does very little to actually change client behavior, it mostly just paves the way for the next update to the "R" workflow to make it handle add/remove cases properly.