A completed row used to ignore d: only a queued transfer could be pulled
out of the list, so a finished one sat there until the next restart. d
now goes through one handler that drops a finished row whatever the
session thinks of it — a completed transfer can live only in this window,
restored from an earlier run, where there is nothing to forget.
The finished-status test was spelled out twice in clear_finished_downloads
and had to agree by hand; both callers now share is_finished().
Michel de Graaf
0f91ffdcf3