
It was added in commit 009d021 but not advertised, and likely not used by an application since then. See: https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/781
It was added in commit 009d021 but not advertised, and likely not used by an application since then. See: https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/781