Cancel print job in Gnome (Debian Stretch)

After over a year of using Debian Stretch, I finally found an issue to write about: it doesn't seem to be possible cancel a print job from the Printers dialogue in Gnome.

Possibly it's this bug, which seems to have been fixed just a few weeks previously to this post, so will still be affecting Stretch.

A solution I found here is to run the CUPS interface and delete the job from there:

http://localhost:631/jobs/

Cheers Zwets for that!