Bug 977056 - [Dialer] Visual discrepancies: Call ended view under conference call participants list

Yeah, I do not like it either so let's give it some thinking. The problem I am facing is that right now when a groupchanged event is notified to a call (see https://github.com/mozilla-b2g/gaia/blob/master/apps/callscreen/js/handled_call.js#L15) because it or any other participant of the conference call hang up, I am not aware of any means to know if the call is still ongoing or if it was the hung up one since in both cases HandledCall.call.state returns "connected". I am not really sure this is right, mainly according to this code: https://github.com/mozilla-b2g/gaia/blob/master/apps/callscreen/js/handled_call.js#L86 which tries to check precisely this. Anyhow, I'll bring this up in today's office hour to discuss about it.