Here’s a little Christmas present. This is GNOME Software working with xdg-app to allow live updates of apps and runtimes.
This is very much a prototype and needs a lot more work, but seems to work for me with xdg-app from git master (compile with
--enable-libxdgapp). If any upstream projects needed any more encouragement, not including an AppData file means the application gets marked as nonfree as we don’t have any project licensing information. Inkscape, I’m looking at you.