Hi there, I print a lot of PDF documents, sometimes I print duplex and sometimes I print single-sided. I have multiple printer configurations set up in CUPS with the duplex setting enable or disabled according to the task. Okular requires me to manually set the duplexing option. I feel that it should use the printer's defined default for duplexing. Thanks!
Thanks for your report. Preselecting the option for duplex is done by the Qt print dialog that is used by Okular and other KDE applications. By now, the requested feature has been implemented for the Qt print dialog (s. https://codereview.qt-project.org/#/c/226881/ ) and will become available with the upcoming Qt version 5.12, so once you have that, this should work as desired.
Great, thanks a lot Michael.