Public bug reported:

Description: 
When we print a larger (more pages) PDF file first, and then print a test page, 
the actual results will become printed in reverse order.

It is reproduced by HP and Brother printer driver too.
We'd like you to answer the following questions.

1. Is it CUPS's specification or bug?
2. If it is a bug, do you have any plan to fix it?
3. Is there any workaround?

Steps to reproduce:
1. Install the same driver from 
http://www.openprinting.org/ppd-o-matic.php?driver=Postscript-Ricoh&printer=Ricoh-SP_8400DN&show=0
 twice and called different name (such as: largeimageprint and normalprint) and 
specify the same printer’s IP address.
2. Get the test PDF file from the following URL
http://www.ricoh.co.jp/pdf/34141700/SP_C751_750_C420e_C352_C342_C341.pdf
3. Open the PDF file, click "File" → "Print", select the "largeimageprint" 
driver and print.
4. When the job information of PDF file is appearing in [Document and Print 
Status] dialog, select the "normalprint" driver to print test page.
5. Confirm the print result

Expected result:
PDF file will be printed first, and then test page will be printed.

Actual result:
Test Page will be printed first, and then PDF file will be printed.

Note:
We confirmed the CUPS error log and found that when the PDF file print (Job No. 
44) is still being processed, but the processing of the test page print (Job 
No. 45) has already been completed. 

  I [19/Feb/2019:10:56:18 +0800] [Job 45] Job completed.
  ......
  D [19/Feb/2019:10:56:22 +0800] cupsdSetBusyState: newbusy="Printing jobs and 
dirty files", busy="Printing jobs and dirty files"
  D [19/Feb/2019:10:56:22 +0800] [Job 44] PID 2097 
(/usr/lib/cups/filter/pdftopdf) exited with no errors.
  ......
  D [19/Feb/2019:10:56:22 +0800] [Job 44] Printer make and model: Ricoh RICOH 
SP 8400DN PS3

Please refer to the attached "error_log_job_No.44-45" for details.

** Affects: cups (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "CUPS error log file"
   
https://bugs.launchpad.net/bugs/1816529/+attachment/5239767/+files/error_log_job_No.44-45

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https://bugs.launchpad.net/bugs/1816529

Title:
  The print order will become reversed

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