Consider you are in middle of a conversation, after you send an sms , your phone locked and then, new message received then you tap on the banner notification and go to read and answer that thread, and you do this a few times. then you open multitasking window and see so many messaging app showing the same thread.
I think it should be this way, if you tap banner notification and there is an open thread for this conversation it should open that, if not open new instance of messaging app.
I think it should be this way, if you tap banner notification and there is an open thread for this conversation it should open that, if not open new instance of messaging app.