GtkPrintOperation does not find CUPS printers with gtk-4.0.0
Steps to reproduce
- Bring up gtk4-demo, and go to the "Printing" tab.
- Press the Run button.
- Examine the print dialog which is started.
With GTK-3.99.4 onwards, including gtk-4.0.0, CUPS printers are not found by GtkPrintOperation. This can be demonstrated using gtk4-demo as above.
Installed printers should be shown by the print dialog.
Linux (kernel 5.10.1), gtk-4.0.0 (configured with print-cups enabled and print-cloudprint disabled) and CUPS 2.3.3