7395aaf9b4
When gnome-shell fails to start on login, gnome-session tries to re-launch it again with all extensions disabled. This is currently implemented by clearing the list of enabled extensions, which means the user needs to re-enable their extensions manually again. To make this process less annoying, add a single 'kill-switch' setting gnome-session can use without interfering with the user setting. https://bugzilla.gnome.org/show_bug.cgi?id=778664