private async Task<long> GetHomeTimeLine_Failover(long sinceid)
{
var largestseenid = sinceid;
var hometl = await UserSession.GetHomeTimeline(count: _sinceIdPagingSize, sinceId: sinceid);
if (!hometl.OK) return largestseenid;
foreach (var tweet in hometl)
{
AddToHomeTimeLine(tweet); // use this guard
if (tweet.Id > sinceid) largestseenid = tweet.Id;
}
return largestseenid;
}