Opening private conversation with new contact should hide new contact notification
The new contact notification that's shown when a contact is introduced should be hidden when opening the contact's private conversation. Touching the notification should open the contact's private conversation.
If multiple contacts have been introduced, each contact should be removed from the notification when opening the contact's private conversation, and touching a notification for multiple new contacts should open the contact list. (This is consistent with the behaviour of the private message notification.)
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