QmlDesigner: Use the global QmlModelView

We should change that QmlModelView architecture anyway. It is not really
fitting. Maybe attach one to the model.

Change-Id: Iee041d6e1972bd2cd9040f932404feffbe5728ef
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/designercore/include/qmlmodelnodefacade.h

@@ -49,7 +49,7 @@ public:
     QmlModelNodeFacade();
 
     bool isRootNode() const;
-    QmlModelView* qmlModelView() const;
+    static QmlModelView* qmlModelView();
 
 
 protected:

src/plugins/qmldesigner/designercore/model/qmlmodelnodefacade.cpp

@@ -29,6 +29,7 @@
 
 #include "qmlmodelnodefacade.h"
 #include "qmlmodelview.h"
+#include <qmldesignerplugin.h>
 #include <QDebug>
 namespace QmlDesigner {
 
@@ -62,16 +63,14 @@ bool QmlModelNodeFacade::isValid() const
     return isValidQmlModelNodeFacade(m_modelNode);
 }
 
-QmlModelView* QmlModelNodeFacade::qmlModelView() const
+QmlModelView* QmlModelNodeFacade::qmlModelView()
 {
-    return modelNode().view()->toQmlModelView();
+    return QmlDesignerPlugin::instance()->viewManager().qmlModelView();
 }
 
 bool QmlModelNodeFacade::isValidQmlModelNodeFacade(const ModelNode &modelNode)
 {
-    QmlModelView * qmlModelView = modelNode.view()->toQmlModelView();
-
-    return modelNode.isValid() && qmlModelView && qmlModelView->nodeInstanceView() && qmlModelView->hasInstanceForModelNode(modelNode) && qmlModelView->instanceForModelNode(modelNode).isValid();
+    return modelNode.isValid() && qmlModelView() && qmlModelView()->nodeInstanceView() && qmlModelView()->hasInstanceForModelNode(modelNode) && qmlModelView()->instanceForModelNode(modelNode).isValid();
 }
 
 bool QmlModelNodeFacade::isRootNode() const