groups with unregistered users are inconsistent and display random behaviour

[Trolldemorted]

• I have searched open and closed issues for duplicates

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Bug description

We have set up a group with an unregistered number to have a debugging playground for signalapp/libsignal-service-java#27. In this group are a friend and i, both with at least on Signal-Desktop instance.

My Signal-Desktop clients happily ignores the fact that we have an unregistered member. My conversation does not display any error triangles, i can only see that one delivery failed in the MessageDetailView.

His Signal-Desktop client displays an error triangle on every outgoing message that was sent from Signal-Desktop:

And sometimes it additionally display two resend buttons:

I honestly do not know what should happen if you use a group with an unregistered user, but three different possible behaviours do not look good to me.

Steps to reproduce

• use a group with an unregistered user

Platform info

Signal v0.26, i am using W10, he is using Ubuntu afaik. I have experienced this some months ago on W10, this is no platform issue.

Link to debug log

His log: http://pastebin.com/VV4F0Fex
My log: https://gist.github.com/569242ab15e4ed88e2f1f01cf8535fff

[riyapenn]

Every message an unregistered user attempts to send will fail as they are no longer a Signal user. So an alert should be on every message. This is the same behavior as the mobile clients.

Is your contact in this chat the unregistered user?

[Trolldemorted]

I am not talking about messages sent from unregistered users (FYI, they sometimes can send messages, see signalapp/Signal-Android#5859).

In the group there are my friend and i + the unregistered dummy.

The triangle is, as i have explained in this issue, is not on every message. On my signal desktop there never is a triangle (message detail view mentions the unregistered user though), while on my friend's signal-desktop there always is a triangle and 0-2 resend buttons. We are both using up-to-date versions of Signal-Desktop, and some months back i also experienced triangles and multiple resend-buttons despite no failed delivery.