filechooserbutton: Add tests for cancelling the dialog via closing it (delete-event), instead of by simulating the Cancel button (response cancel)
filechooserbutton: Add tests for cancelling the dialog via closing it (delete-event), instead of by simulating the Cancel button (response cancel)

Signed-off-by: Federico Mena Quintero <4999915a961edfd7686112c2935288e1266eae14@gnome.org>

johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk