contacts can't be deleted
V 20180629 play A 7.1.2
Installed, created an account without registering, and scanned a new contact, sent a message.
Deleting the conversation in the main view (long press) does not remove it. After the attempt, the name of the contact is deleted, but the contact stays with only the ring:xyz... shown.
With the f-droid version, it even happens that contacts appear twice after attempting to delete.