Moving a print job from one print queue to another one fails in print-manager. I just retested with the current git version (master branch at commit 032be7246) on KDE neon.

Steps to reproduce:

* Make sure at least two printers are set up on the system. It is assumed that they are called "firstprinter" and "secondprinter" in the following.
* Pause printer "firstprinter" (e.g. using the "Pause Printer" button in print-manager's view of the queue or using the command "cupsdisable firstprinter")
* create a print job for printer "firstprinter" (e.g. using the command "echo hello | lp -d firstprinter")
* show the queue using print-manager, e.g. by opening the queue from the applet or by directly using the command "kde-print-queue firstprinter"
* try to move the print job to the other printer "secondprinter":
  * right click on the print job in the list
  * Select "Move to" -> "secondprinter"

Actual Result:
A dialog pops up, saying that moving the print job failed: "Failed to move '(stdin)' to 'secondprinter'". When clicking on the "Details" button, it says: "The printer or class does not exist."

Expected result:
The print job should successfully be moved to the other printer and printed on it.

I have worked on a solution quite a while ago and am planning to supply a patch soon.