
We checked if we were using the usig the X11 backend to decide when to deal with a11y event posting - in order to make the clutter code less windowing system dependent, make this check a check whether we're a display server or not, in contrast to a window/compositing manager client. This is made into a vfunc ot ClutterBackendClass, implemented by MetaClutterBackendNative and MetaClutterBackendX11. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1364