derbyjs / racer / 895

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Fix deferred unload (see a320772a) when unfetching then synchronously subscribing

When a doc gets unfetched, that adds a Share Doc whenNothingPending listener to unload the doc. However, Racer keeps reference counts itself for subscriptions, so an immediate subscribe on the same Racer doc does not affect the Share doc at all, which means the doc would still get unloaded.

This fix instead retries the Racer _maybeUnloadDoc in that scenario, which guards against Racer getting new doc references while the Share Doc whenNotingPending is in progress.

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