A car merging right into the bike lane, and waiting there until it's clear before making the right turn seems like the most sensible thing for a couple of reasons. First, if the car moves right when practice (across or blocking the bike lane), it prevents (or lessens) the chance of the driver waiting until just at the corner and making the right turn and possible turning directly into the path of a bike approaching from the rear (this has happened to me). Because...presumably...if the car is in the process of, or about to make the turn...that means it must be clear for the bike to enter the intersection. Secondly, bike shouldn't be upset if a car is waiting in the bike lane to negotiate the turn. If the car can't go due to traffic, then clearly it's not safe for a bike to go.

Dan