[okular] [Bug 373133] 16.12.0 Okular duplex printing on but no duplex printing done

[Moritz Bunkus]

https://bugs.kde.org/show_bug.cgi?id=373133

--- Comment #19 from Moritz Bunkus <moritz at bunkus.org> ---
In my opinion it "used to work" in Qt4-based Okular because it used Qt4's print
dialog, and Qt4's print dialog still listed all the properties present in the
PPD.

This functionality was removed from Qt, though; see [1]. Only a small subset of
options have been reimplemented.

The "other software that works" most likely uses the options from the PPD
directly, or it contains some heuristics for determining the actual option name
the PPD wants for a certain feature.

[1] https://bugreports.qt.io/browse/QTBUG-54464

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