Qwebview and printer issue(paper size)

[Nouriemm]

Hello everyone,
I have got a QWebView widget in my application. it shows HTML very well.
But
When it comes to printing the html page, it does not like the defined printer properties:

QPrinter printer;
printer.setOrientation(QPrinter::Landscape);
printer.setPaperSize(QPrinter::A6);
printer.setPageMargins(5,5,5,5,QPrinter::Millimeter);
printer.setFullPage(true); 

ui->webView->print(&printer);

As you see I want to print on an A6 paper(A6 paper is a quarter of an A4). In result, all the time it gives me Letter standard page rather than A6.

I have prepared a project which reflect the issue and it's downloadable from the link below:
http://wikisend.com/download/679960/printerIssue.zip

Thanks in advance

[Nouriemm]

Anyone?
Any Idea?