VectorImage: Implement support for switch control

There is some support for SVG's switch in Qt Svg, so we support
the same in VectorImage and svgtoqml.

Pick-to: 6.8
Fixes: QTBUG-121645
Change-Id: Ifb90fad3f16337b2a71b48d796dfb0fad82b39b4
Reviewed-by: Hatem ElKharashy <hatem.elkharashy@qt.io>

src/quickvectorimage/generator/qsvgvisitorimpl.cpp

@@ -947,6 +947,22 @@ void QSvgVisitorImpl::visitUseNode(const QSvgUse *node)
     handleBaseNodeEnd(node);
 }
 
+bool QSvgVisitorImpl::visitSwitchNodeStart(const QSvgSwitch *node)
+{
+    QSvgNode *link = node->childToRender();
+    if (!link)
+        return false;
+
+    QSvgVisitor::traverse(link);
+
+    return false;
+}
+
+void QSvgVisitorImpl::visitSwitchNodeEnd(const QSvgSwitch *node)
+{
+    Q_UNUSED(node);
+}
+
 bool QSvgVisitorImpl::visitDefsNodeStart(const QSvgDefs *node)
 {
     Q_UNUSED(node)

src/quickvectorimage/generator/qsvgvisitorimpl_p.h

@@ -49,6 +49,9 @@ protected:
     bool visitDocumentNodeStart(const QSvgTinyDocument *node) override;
     void visitDocumentNodeEnd(const QSvgTinyDocument *node) override;
 
+    bool visitSwitchNodeStart(const QSvgSwitch *node) override;
+    void visitSwitchNodeEnd(const QSvgSwitch *node) override;
+
 private:
     void fillCommonNodeInfo(const QSvgNode *node, NodeInfo &info);
     void handleBaseNodeSetup(const QSvgNode *node);