Qt item parenting and garbage collection

Remove dupl/obsolete code

src/Mod/TechDraw/Gui/MDIViewPage.cpp

@@ -99,6 +99,8 @@ MDIViewPage::MDIViewPage(ViewProviderPage *pageVp, Gui::Document* doc, QWidget*
     pageGui(pageVp),
     m_frameState(true)
 {
+
+    m_scene = new QGraphicsScene(this);
     m_view = new QGVPage(pageVp,m_scene,this);
 
     m_exportSVGAction = new QAction(tr("&Export SVG"), this);