n_pages_to_print
Description:
The number of pages that will be printed.
Note that this value is set during print preparation phase (gtk_print_status_preparing), so this value should
never be get before the data generation phase (gtk_print_status_generating_data). You can connect to the [
signal@Gtk.PrintOperation:GtkPrintOperation:status-changed] signal and call [method@Gtk.PrintOperation.get_n_pages_to_print] when
print status is gtk_print_status_generating_data.
This is typically used to track the progress of print operation.