https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1416
CrCascadePrivate->sheets is a statically-sized array inside the struct; it can't be NULL. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/861#note_659216
This is all of the original libcroco, minus these two which we don't use: - cr-sel-eng - the CSS selection engine for xmlNode. - cr-style. Part of https://gitlab.gnome.org/GNOME/gnome-shell/issues/1934