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When the user opens documents from three targets A, B, and C in quick succession, then we don’t want to schedule preparation of wait until A *and* B are finished preparing before preparing C. Instead, we want to - Finish for preparation of A to finish if it has already started by the time the file in C is opened. This is done so we always make progress during preparation and don’t get into a scenario where preparation is always cancelled if a user switches between two targets more quickly than it takes to prepare those targets. - Not prepare B because it is no longer relevant and we haven’t started any progress here. Essentially, we pretend that the hop to B never happened.