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

[Michael Weghorn]

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

--- Comment #20 from Michael Weghorn <m.weghorn at posteo.de> ---
I suppose that you are right that this is because the Qt 5 print dialog does no
more display all options from the PPD, but only selected ones at the moment
(like "Duplex").

In Firefox print dialog: Is the duplex option available in the "Page Settings"
tab under "Two-sided" or only in an "Advanced" tab under "Two-Sided Printing"
(or similar). The latter would confirm that it is handled as a "custom" PPD
option (rather than the default "Duplex" option which would be shown in the
"Page Settings" tab).

In case the vendor-specific keyword is actually the cause and this is therefore
the general problem with Qt 5's current printing dialog, I currently see no
"reasonable" way of adding support in Okular, rather than working on Qt itself.

For reference: Some discussion about printer-specific options in the Qt 5 print
dialog has also taken place on the Qt development mailing list in January and
February, s. thread "Printer-specific options in Qt5's print dialog (Linux,
CUPS)" at [1] and [2].


[1] http://lists.qt-project.org/pipermail/development/2017-January/thread.html
[2] http://lists.qt-project.org/pipermail/development/2017-February/thread.html

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