Implement the XDG session management protocol, in order to allow clients to ask the compositor to save window state for them. This works via creating a xdg_session_v1 object...
Stability for the end user is very good (probably even one of the best and definitely many times better than KDE) but stability for developers is not good because things often change or get deprecated which breaks the apps and the extensions they make.
How so? There are lots of valid complains about gnome but stability is not one of them. They are very careful about the stuff they ship by default.
Stability for the end user is very good (probably even one of the best and definitely many times better than KDE) but stability for developers is not good because things often change or get deprecated which breaks the apps and the extensions they make.