[okular] [Bug 526774] Duplex printing produces upside-down back pages regardless of long-edge or short-edge setting

[Jean-Michel Elyn]

https://bugs.kde.org/show_bug.cgi?id=526774

Jean-Michel Elyn <elyn.jean-michel at pm.me> changed:

           What    |Removed                     |Added
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                 CC|                            |elyn.jean-michel at pm.me

--- Comment #1 from Jean-Michel Elyn <elyn.jean-michel at pm.me> ---
I can confirm this issue on Arch Linux with a Brother MFC-L8390CDW printer
connected via IPPS.

Software versions:
- Okular: 26.08.2-1
- qt6-base: 6.12.0-3
- CUPS: 2:2.4.20-1

Printer configuration:
- URI: `ipps://printer.local:443/ipp/print`
- Default duplex setting: `DuplexNoTumble` (long-edge binding)

Test results with the same PDF and printer:
- Okular: selecting "Long Edge" produces short-edge binding. The selected
option remains correct in the print dialog.
- LibreOffice: long-edge duplex printing works correctly.
- qpdfview (also using Qt): long-edge duplex printing works correctly.
- Direct CUPS printing with `lp -o sides=two-sided-long-edge`: works correctly.

Since qpdfview uses Qt and prints correctly, the issue appears to be specific
to Okular's printing path rather than a general Qt or CUPS problem.

The issue is still reproducible with Okular 26.08.2 and Qt 6.12.0.

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