Doc: Remove widgets examples from Qt Print Support documentation

The .qdocconf file for Qt Print Support includes examples/widgets in
its exampledirs, presumably because a few examples there have printing
support. The documentation for these examples is not accessible from
Print Support index/module pages, and qdoc prints a lot of warnings
for them (missing images).

There's only few dependencies to examples in Print Support docs.
These are resolved by copying a code snippet to correct place,
and removing \sa links from QAbstractPrintDialog.

Task-number: QTBUG-31137
Change-Id: Iac20d151f93ac16449241c6ee85979781b26e607
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>

src/printsupport/dialogs/qabstractprintdialog.cpp

@@ -404,8 +404,7 @@ void QAbstractPrintDialogPrivate::setPrinter(QPrinter *newPrinter)
     Mac OS X. This is no longer supported in Qt 4.5. If you want this
     functionality, use QPrintDialog::open().
 
-    \sa QPageSetupDialog, QPrinter, {Pixelator Example}, {Order Form Example},
+    \sa QPageSetupDialog, QPrinter
-        {Image Viewer Example}, {Scribble Example}
 */
 
 /*!

src/printsupport/doc/qtprintsupport.qdocconf

@@ -33,8 +33,7 @@ headerdirs  += ..
 
 sourcedirs  += ..
 
-exampledirs += ../../../examples/widgets \
+exampledirs += ../ \
-               ../ \
                snippets
 
 excludedirs += ../../../examples/widgets/doc

src/printsupport/doc/snippets/widgetprinting.cpp

@@ -39,6 +39,11 @@
 ****************************************************************************/
 
 #include <QtGui>
+#include <QtWidgets>
+#ifndef QT_NO_PRINTER
+#include <QPrinter>
+#include <QPrintDialog>
+#endif
 
 class Window : public QWidget
 {
@@ -48,14 +53,20 @@ public:
     Window() {
         myWidget = new QPushButton("Print Me");
         connect(myWidget, SIGNAL(clicked()), this, SLOT(print()));
+        myWidget2 = new QPushButton("Print Document");
+        connect(myWidget2, SIGNAL(clicked()), this, SLOT(printFile()));
+        editor = new QTextEdit(this);
 
         QVBoxLayout *layout = new QVBoxLayout;
         layout->addWidget(myWidget);
+        layout->addWidget(myWidget2);
+        layout->addWidget(editor);
         setLayout(layout);
     }
 
 private slots:
     void print() {
+    #if !defined(QT_NO_PRINTER)
         QPrinter printer(QPrinter::HighResolution);
 
         printer.setOutputFileName("test.pdf");
@@ -73,12 +84,34 @@ private slots:
 
         myWidget->render(&painter);
 //! [0]
+    #endif
+    }
+
+    void printFile() {
+    #if !defined(QT_NO_PRINTER) && !defined(QT_NO_PRINTDIALOG)
+//! [1]
+        QPrinter printer;
+
+        QPrintDialog dialog(&printer, this);
+        dialog.setWindowTitle(tr("Print Document"));
+        if (editor->textCursor().hasSelection())
+            dialog.addEnabledOption(QAbstractPrintDialog::PrintSelection);
+        if (dialog.exec() != QDialog::Accepted) {
+            return;
+        }
+//! [1]
+        editor->print(&printer);
+    #endif
     }
 
 private:
     QPushButton *myWidget;
+    QPushButton *myWidget2;
+    QTextEdit   *editor;
 };
 
+#include "main.moc"
+
 int main(int argv, char **args)
 {
     QApplication app(argv, args);
@@ -88,6 +121,3 @@ int main(int argv, char **args)
 
     return app.exec();
 }
-
-#include "main.moc"
-

src/printsupport/doc/src/qtprintsupport-index.qdoc

@@ -65,7 +65,7 @@
   a QPrintDialog, allowing the user to specify the printer to use, paper size, and
   other printing properties.
 
-  \snippet richtext/orderform/mainwindow.cpp 18
+  \snippet widgetprinting.cpp 1
 
   It is also possible to set certain default properties by modifying the QPrinter
   before it is supplied to the print dialog. For example, applications that