Printing vs PrintToPDF

[Peter]

Hello,

I'm trying to replace the usual printing with PrintToPDF (and failing to see any paper size/orientation to work except A4/vertical, but that's another question), and currently I'm doing this by returning false from ClientPrintHandlerGtk::OnPrintDialog(), and then calling PrintToPDF. However, sometimes I notice a delay before ClientPrintHandlerGtk::OnPrintDialog() is called, and it looks like the document is being internally rendered into PDF - which is then discarded, and re-rendered again, but this time by my PrintToPDF call.
This all happens on Linux/GTK and the code is based on the CefClient example.
Not sure how much sense this all makes, but I'm looking for a way to not waste time re-generating the printed document twice... and maybe even find a way to print in landscape orientation and other paper sizes than A4.