From the docs for Gtk.FileDialog.save ()
This function initiates a file save operation by presenting a file chooser dialog to the user.
The callback will be called when the dialog is dismissed. It should call [method@Gtk.FileDialog.save_finish] to obtain the result.
My issue and question is around the fact that there is no
save_finish method listed in the docs. Similarly missing are
select_folder_finish etc. Is there something I am missing or is the Vala interface to these widgets incomplete?