QmlDesigner: create DesignerSupport on stack

- it has the same life cycle like the Qt5NodeInstanceServer
 - we don't need to create and delete it (with maybe memory leaks)
 - this fixes a crash while the puppet is closed after an item deletion

Change-Id: Iecd6515eb41324b95e99e151d77ee74895230182
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.cpp

@@ -42,8 +42,7 @@
 namespace QmlDesigner {
 
 Qt5NodeInstanceServer::Qt5NodeInstanceServer(NodeInstanceClientInterface *nodeInstanceClient)
-    : NodeInstanceServer(nodeInstanceClient),
-      m_designerSupport(new DesignerSupport)
+    : NodeInstanceServer(nodeInstanceClient)
 {
     DesignerSupport::activateDesignerMode();
 }
@@ -51,8 +50,6 @@ Qt5NodeInstanceServer::Qt5NodeInstanceServer(NodeInstanceClientInterface *nodeIn
 Qt5NodeInstanceServer::~Qt5NodeInstanceServer()
 {
     delete quickView();
-    delete m_designerSupport;
-    m_designerSupport = 0;
 }
 
 QQuickView *Qt5NodeInstanceServer::quickView() const
@@ -128,21 +125,18 @@ void Qt5NodeInstanceServer::refreshBindings()
     DesignerSupport::refreshExpressions(context());
 }
 
-DesignerSupport *Qt5NodeInstanceServer::designerSupport() const
+DesignerSupport *Qt5NodeInstanceServer::designerSupport()
 {
-    return m_designerSupport;
+    return &m_designerSupport;
 }
 
 void Qt5NodeInstanceServer::createScene(const CreateSceneCommand &command)
 {
-    m_designerSupport = new DesignerSupport;
     NodeInstanceServer::createScene(command);
 }
 
 void Qt5NodeInstanceServer::clearScene(const ClearSceneCommand &command)
 {
-    delete m_designerSupport;
-    m_designerSupport = 0;
     NodeInstanceServer::clearScene(command);
 }
 

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.h

@@ -34,10 +34,10 @@
 #include <QtGlobal>
 
 #include "nodeinstanceserver.h"
+#include "designersupport.h"
 
 QT_BEGIN_NAMESPACE
 class QQuickItem;
-class DesignerSupport;
 QT_END_NAMESPACE
 
 namespace QmlDesigner {
@@ -54,7 +54,7 @@ public:
     QQmlEngine *engine() const Q_DECL_OVERRIDE;
     void refreshBindings() Q_DECL_OVERRIDE;
 
-    DesignerSupport *designerSupport() const;
+    DesignerSupport *designerSupport();
 
     void createScene(const CreateSceneCommand &command) Q_DECL_OVERRIDE;
     void clearScene(const ClearSceneCommand &command) Q_DECL_OVERRIDE;
@@ -69,7 +69,7 @@ protected:
 
 private:
     QPointer<QQuickView> m_quickView;
-    DesignerSupport *m_designerSupport;
+    DesignerSupport m_designerSupport;
 };
 
 } // QmlDesigner