Can you please show me one of these merge requests that was submitted? If there is any chance of it getting merged, the patch should be against GTK4 master.
I personally don't care as one can use flatpak portals nowadays (qt makes it really easy for non-flatpak applications to use, but I haven't seen how I can do it in non-flatpak gtk applications).
Those are old and obsolete patches for GTK2 and GTK3 that to my knowledge were never submitted upstream, and currently it's too late to do that as GTK2 and 3 are not being developed anymore. If there is an open merge request for GTK4 that I am not aware of, please show it.
I personally don't care as one can use flatpak portals nowadays (qt makes it really easy for non-flatpak applications to use, but I haven't seen how I can do it in non-flatpak gtk applications).