gtk3.22: toplevel not destroyed on quit
gtk3.22-client (and presumably all other gtk-clients) does not destroy toplevel window on quit.
New versions for master & S3_1: Correct gtk3x-client compatibility check; gtk_window_destroy() instead of gtk_widget_destroy() should be used from gtk-3.98.4, not gtk-3.99.0
gtk3.22-client (and presumably all other gtk-clients) does not destroy toplevel window on quit.