switch printer tray during printing

[Michael Cronenworth <mike cchtml com>]

Does anyone know if GTK allows switching print trays in the middle of a
GtkPrintOperation?

I tried setting the source to Tray 2 in the "request-page-setup" signal
for the second page, but this did not work. The second page printed to
Tray 1 (default).

Thanks,
Michael