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119bee66ce
This patch adds a new `cancel_in_flight_request` argument to `SlidingSync::subscribe_to_rooms`, which tells the method cancel the in-flight request if any. This patch also updates `RoomListService::subscribe_to_rooms` to turn this new argument to `true` if the state machine isn't in a “starting” state. The problem it's solving is the following: * some apps starts the room list service * a first request is sent with `pos = None` * the server calculates a new session (which can be expensive) * the app subscribes to a set of rooms * a second request is immediately sent with `pos = None` again * the server does possibly NOT cancel its previous calculations, but starts a new session and its calculations This is pretty expensive for the server. This patch makes so that the immediate room subscriptions will be part of the second request, with the first request not being cancelled.