[GNOME] Usability regression caused by the new out-of-call chat feature

Issue generated from Tuleap's migration script. Originally submitted by: Baptiste Jonglez (baptiste)

In the Gnome client, since c6a3b98a ("out of call chat"), when single-clicking on a contact in the history, the out-of-call chat interface is opened.

But then, there is no way to go back to the welcome screen, with the ring logo and our own Ring ID.  It seems to me like a major usability regression.  To obtain his/her own Ring ID, the user must close the client and open it again.