There is no event processing after the locate, and so the event that is (was)
queued at the loop start will not be processed, and each time we reach the
loop end, we will try (and fail) to queue an identical event (fail because
duplicate events are not allowed). We don't need this event (or signal) at
all, because locates (and then ::start_transport() while looping do not
represent a state change that any UI needs to know about.
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