Comment 38 for bug 1505409

Come to think of it, fixing bug 1724185 might also stop this and bug 1556601 from happening (most of the time, not all the time).

At the moment when gnome-shell/mutter shuts down, Xwayland doesn't cope well and may silently crash, which in turn is caught by gnome-shell and gnome-shell crashes with "Connection to xwayland lost". So the act of trying to debug the situation here and fixing bug 1724185 first might actually avoid most instances of this one too.