The last comment made me realize we are talking about the Qt frontend here, and yes, sure, we only ever implemented deb822 for the Gtk frontend and the Dbus backend.
The Qt frontend needs to gain a deb822 entry editor dialog, possibly some rendering fixes for deb822 source entries, and swap on deb822=True in the SoftwareProperties.__init__() supercall to enable it.
The last comment made me realize we are talking about the Qt frontend here, and yes, sure, we only ever implemented deb822 for the Gtk frontend and the Dbus backend.
The Qt frontend needs to gain a deb822 entry editor dialog, possibly some rendering fixes for deb822 source entries, and swap on deb822=True in the SoftwarePropert ies.__init_ _() supercall to enable it.