Clean up old PostScript printing code

PostScript support was removed back in 2011:
34f712e79e

- The QPSPrint* classes are gone
- The QPrinter::OutputFormat enum only has NativeFormat and PdfFormat
  constants
- QPaintEngine::PostScript is unused now

Change-Id: I27d595b92341f41e14bd1e4fd860eac6826d7890
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/gui/painting/qpaintengine.cpp

@@ -374,7 +374,7 @@ void QPaintEngine::drawPolygon(const QPoint *points, int pointCount, PolygonDraw
     \value CoreGraphics Mac OS X's Quartz2D (CoreGraphics)
     \value QuickDraw Mac OS X's QuickDraw
     \value QWindowSystem Qt for Embedded Linux
-    \value PostScript
+    \value PostScript (No longer supported)
     \value OpenGL
     \value Picture QPicture format
     \value SVG Scalable Vector Graphics XML format

src/gui/painting/qpaintengine.h

@@ -196,7 +196,7 @@ public:
         Windows,
         QuickDraw, CoreGraphics, MacPrinter,
         QWindowSystem,
-        PostScript,
+        PostScript,   // ### Qt 6: Remove, update documentation
         OpenGL,
         Picture,
         SVG,
@@ -253,7 +253,6 @@ private:
 #ifndef QT_NO_QWS_QPF2
     friend class QFontEngineQPF;
 #endif
-    friend class QPSPrintEngine;
     friend class QMacPrintEngine;
     friend class QMacPrintEnginePrivate;
     friend class QFontEngineQPA;

src/gui/text/qfont.h

@@ -285,7 +285,6 @@ private:
     friend class QFontInfo;
     friend class QPainter;
     friend class QPainterPrivate;
-    friend class QPSPrintEngineFont;
     friend class QApplication;
     friend class QWidget;
     friend class QWidgetPrivate;

src/gui/text/qfontengine_p.h

@@ -411,8 +411,6 @@ public:
     virtual void setFallbackFamiliesList(const QStringList &) {}
 
 protected:
-    friend class QPSPrintEnginePrivate;
-    friend class QPSPrintEngineFontMulti;
     friend class QRawFont;
     virtual void loadEngine(int at) = 0;
     virtual void ensureFallbackFamiliesQueried() {}

src/gui/text/qtextlayout.h

@@ -188,7 +188,6 @@ private:
     Q_DISABLE_COPY(QTextLayout)
 
     friend class QPainter;
-    friend class QPSPrinter;
     friend class QGraphicsSimpleTextItemPrivate;
     friend class QGraphicsSimpleTextItem;
     friend void qt_format_text(const QFont &font, const QRectF &_r, int tf, const QTextOption *, const QString& str,

src/printsupport/dialogs/qprintpreviewdialog.cpp

@@ -562,15 +562,8 @@ void QPrintPreviewDialogPrivate::_q_print()
 
 #if defined(Q_OS_WIN) || defined(Q_OS_MAC)
     if (printer->outputFormat() != QPrinter::NativeFormat) {
-        QString title;
-        QString suffix;
-        if (printer->outputFormat() == QPrinter::PdfFormat) {
-            title = QCoreApplication::translate("QPrintPreviewDialog", "Export to PDF");
-            suffix = QLatin1String(".pdf");
-        } else {
-            title = QCoreApplication::translate("QPrintPreviewDialog", "Export to PostScript");
-            suffix = QLatin1String(".ps");
-        }
+        QString title = QCoreApplication::translate("QPrintPreviewDialog", "Export to PDF");
+        QString suffix = QLatin1String(".pdf");
         QString fileName = QFileDialog::getSaveFileName(q, title, printer->outputFileName(),
                                                         QLatin1Char('*') + suffix);
         if (!fileName.isEmpty()) {