QmlDesigner.formEditor: fixes memory leak

Also fixes the memory leak in resize code.
cleanup

Reviewed-by: Marco Bubke

src/plugins/qmldesigner/components/formeditor/movemanipulator.cpp

@@ -198,8 +198,6 @@ QPointF MoveManipulator::findSnappingOffset(const QHash<FormEditorItem*, QRectF>
 
 void MoveManipulator::generateSnappingLines(const QHash<FormEditorItem*, QRectF> &boundingRectHash)
 {
-    qDeleteAll(m_graphicsLineList);
-    m_graphicsLineList.clear();
     m_graphicsLineList = m_snapper.generateSnappingLines(boundingRectHash.values(),
                                                          m_layerItem.data(),
                                                          m_snapper.transformtionSpaceFormEditorItem()->sceneTransform());
@@ -417,8 +415,10 @@ void MoveManipulator::setOpacityForAllElements(qreal opacity)
 void MoveManipulator::deleteSnapLines()
 {
     if (m_layerItem) {
-        foreach (QGraphicsItem *item, m_graphicsLineList)
+        foreach (QGraphicsItem *item, m_graphicsLineList) {
             m_layerItem->scene()->removeItem(item);
+            delete item;
+        }
     }
     m_graphicsLineList.clear();
     m_view->scene()->update();

src/plugins/qmldesigner/components/formeditor/resizemanipulator.cpp

@@ -474,8 +474,10 @@ bool ResizeManipulator::isInvalidSize(const QSizeF & size)
 void ResizeManipulator::deleteSnapLines()
 {
     if (m_layerItem) {
-        foreach (QGraphicsItem *item, m_graphicsLineList)
+        foreach (QGraphicsItem *item, m_graphicsLineList) {
             m_layerItem->scene()->removeItem(item);
+            delete item;
+        }
     }
 
     m_graphicsLineList.clear();