Fix for DPI issue on OS X.

On OS X, the resolution is clamped to default output device's supported resolutions. Then, when changing the device to PDF, the clamped value would be used, rather than the desired resolution. Simply setting the resolution after the PDF format is selected fixes the issue.

src/lib/pdfconverter.cc

@@ -265,11 +265,11 @@ qreal PdfConverterPrivate::calculateHeaderHeight(PageObject & object, QWebPage &
 
 QPrinter * PdfConverterPrivate::createPrinter(const QString & tempFile) {
     QPrinter * printer = new QPrinter(settings.resolution);
-    printer->setResolution(settings.dpi);
     //Tell the printer object to print the file <out>
 
     printer->setOutputFileName(tempFile);
     printer->setOutputFormat(QPrinter::PdfFormat);
+    printer->setResolution(settings.dpi);
 
     if ((settings.size.height.first != -1) && (settings.size.width.first != -1)) {
         printer->setPaperSize(QSizeF(settings.size.width.first,settings.size.height.first + 100), settings.size.height.second);
@@ -344,11 +344,11 @@ void PdfConverterPrivate::pagesLoaded(bool ok) {
 	  lout = tempOut.create(".pdf");
 
 	printer = new QPrinter(settings.resolution);
-	printer->setResolution(settings.dpi);
 	//Tell the printer object to print the file <out>
 
 	printer->setOutputFileName(lout);
 	printer->setOutputFormat(QPrinter::PdfFormat);
+	printer->setResolution(settings.dpi);
 
 	//We currently only support margins with the same unit
 	if (settings.margin.left.second != settings.margin.right.second ||