Doc: Fix documentation warnings for Qt GUI

- Remove obsolete dependencies and references.
- Restore previously deleted snippet code referenced in
  richtext.qdoc.
- Add widgets snippets path to exampledirs; some  classes
  were moved from QtWidgets to QtGUI and related \snippet
  commands were broken.
- Mark internal functions under QNativeInterface::Private
  as \internal.

Task-number: QTBUG-86295
Change-Id: I9c165c860c7191dac65972d702698a1745bff77f
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

2 files changed, 38 insertions, 0 deletions

diff --git a/src/gui/doc/snippets/textdocument-tables/mainwindow.cpp b/src/gui/doc/snippets/textdocument-tables/mainwindow.cpp
index 7712362d57..ab00f43c2e 100644
--- a/src/gui/doc/snippets/textdocument-tables/mainwindow.cpp
+++ b/src/gui/doc/snippets/textdocument-tables/mainwindow.cpp
@@ -193,3 +193,35 @@ void MainWindow::showTable()
     tableWidget->show();
 }
 
+void MainWindow::processFrame(QTextFrame *)
+{
+}
+
+void MainWindow::processBlock(QTextBlock)
+{
+}
+
+void MainWindow::processTable(QTextTable *table)
+{
+    QTextFrame *frame = qobject_cast<QTextFrame *>(table);
+//! [13]
+    QTextFrame::iterator it;
+    for (it = frame->begin(); !(it.atEnd()); ++it) {
+
+        QTextFrame *childFrame = it.currentFrame();
+        QTextBlock childBlock = it.currentBlock();
+
+        if (childFrame) {
+            QTextTable *childTable = qobject_cast<QTextTable*>(childFrame);
+
+            if (childTable)
+                processTable(childTable);
+            else
+                processFrame(childFrame);
+
+        } else if (childBlock.isValid()) {
+            processBlock(childBlock);
+        }
+    }
+//! [13]
+}
diff --git a/src/gui/doc/snippets/textdocument-tables/mainwindow.h b/src/gui/doc/snippets/textdocument-tables/mainwindow.h
index b0ff5c1b91..37a7cc289d 100644
--- a/src/gui/doc/snippets/textdocument-tables/mainwindow.h
+++ b/src/gui/doc/snippets/textdocument-tables/mainwindow.h
@@ -53,6 +53,9 @@
 #include <QMainWindow>
 
 class QTextEdit;
+class QTextFrame;
+class QTextBlock;
+class QTextTable;
 
 class MainWindow : public QMainWindow
 {
@@ -67,6 +70,9 @@ public slots:
 
 private:
     bool writeXml(const QString &fileName);
+    void processFrame(QTextFrame *);
+    void processBlock(QTextBlock);
+    void processTable(QTextTable *table);
 
     QTextEdit *editor = nullptr;
 };