Seen logs user as offline even if linked identity remains

[marcog]

23:56 < marcog> tibid: seen kieren
23:56 < tibid> marcog: kieren was last seen 2 days, 5 hours, 18 minutes and 24 seconds ago in
               #algorithm on shadowfire [2011-04-23 18:38:33 SAST], and has been offline on
               shadowfire since 2011-04-23 18:43:48 SAST
23:56 < marcog> tibid: list kieren's identities
23:56 < tibid> marcog: kieren is kieren|mobile on shadowfire and kieren on shadowfire

At this point in time, kieren was online but kieren|mobile had logged off. It appears as though kieren|mobile logging off triggered ibid to mark kieren as offline, which is not the case.

[Stefano Rivera (stefanor)]

I guess this should take advantage of our channel tracker