wait for first pass to complete before second pass

Otherwise the bloom filter may not be fully populated when the second
pass starts, which could have led to incorrect behavior with --all -J,
probably in very rare circumstances.

Command/Sync.hs

@@ -656,6 +656,7 @@ seekSyncContent o rs currbranch = do
 				l <- workTreeItems ww (contentOfOption o)
 				seekworktree mvar l (const noop)
 				pure Nothing
+	waitForAllRunningCommandActions
 	withKeyOptions' (keyOptions o) False
 		(return (commandAction . gokey mvar bloom))
 		(const noop)