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If, on the buffer list activity, you press the phone's "back" button, you're returned to the login screen, even though you're already connected. Similarly, if you launch the app from the launcher or homescreen (instead of the notification bar) when it's already connected, you're presented with just the login screen instead of the buffer list.
I fixed this in my fork, but I think I messed up somewhere along the line, so any pull request I try to make seems to have github asking you to pull in 36 of my commits, which is just crazy (some are probably useful features, but I'm not satisfied that many are stable enough to be pulled into the main project just yet...).
Anyway, my fix is here: aziraphale@9dd257e
Very simple fix to a very annoying bug :)
This is fixed in master now, fixed it by introducing a splash screen when starting the app if all activities have been killed. Figured that would look better then the login screen flashing for a second before it sends you to the buffer activity. Also made backing from the buffer view if connected actually back you out of the application as bumping you to login makes little sense if you are already connected.