pub fn present_since(
reading: Option<(Session, Duration)>,
pressed: Option<Duration>,
) -> Option<bool>Expand description
present_of, from the session as last read (kept_session: the reading
and how long ago it was made; none when there is none fresh enough) and
the last press in Sioul (how long ago): a press made since the reading
counts whatever the reading said, its lock included (someone unlocked the
computer to make it); an older one as present_of reads it. No reading, a
press within PRESENT says someone, and nothing else says anything
(unknown: Sioul running counts).