Bug#1013437: cups: Nothing prints from driverless IPP queues unless added via lpadmin

["Gareth Evans" <donotspam@fastmail.fm>]

I had forgotten that the testing in my previous message was with

cups 2.3.3op2-3+deb11u1 

where deleting all queues and restarting cups at least results in reliable queue creation for the autodetected printer.

The situation is worse with 2.3.3op2-3+deb11u2.

The queue for the auto-detected printer is only created if no other queue already exists.
It still doesn't print.

And even worse:

$ sudo lpadmin -p testqhostname -v ipp://192.168.0.14/ipp/print -E -m driverless:ipp://192.168.0.14/ipp/print
lpadmin: Printer drivers are deprecated and will stop working in a future version of CUPS.
lpadmin: Unable to open PPD "/tmp/3986562c28d87": Missing PPD-Adobe-4.x header on line 0.

No queue is created even after reboot, retry.

I will update upstream with the details of both sets of problems.

Thanks,
Gareth