QPrintDialog for unix has multiple settings for duplex printing

In QPrintDialog for Unix you can set Duplex printing in Options->Options->Duplex Printing or in Properties->Advanced->Double-Sided printing

This makes no sense and moreover is not in sync, so i can have None in the first and Long Edge (Standard) in the second making the user very confuse on which setting is going to be used.

Either keeping them in sync or removing one of them (probably the Properties->Advanced->Double-Sided printing) would be a reasonable solution