QmlDesigner: Double click in the form editor only for the left mouse button

Change-Id: I130bacab8d94ddc5b8544a1b74d662059f976aca
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

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

@@ -209,11 +209,13 @@ void AbstractFormEditorTool::mouseReleaseEvent(const QList<QGraphicsItem*> & /*i
     }
 }
 
-void AbstractFormEditorTool::mouseDoubleClickEvent(const QList<QGraphicsItem*> &itemList, QGraphicsSceneMouseEvent *)
+void AbstractFormEditorTool::mouseDoubleClickEvent(const QList<QGraphicsItem*> &itemList, QGraphicsSceneMouseEvent *event)
 {
-    FormEditorItem *formEditorItem = topFormEditorItem(itemList);
-    if (formEditorItem)
-        view()->changeToCustomTool(formEditorItem->qmlItemNode().modelNode());
+    if (event->button() == Qt::LeftButton) {
+        FormEditorItem *formEditorItem = topFormEditorItem(itemList);
+        if (formEditorItem)
+            view()->changeToCustomTool(formEditorItem->qmlItemNode().modelNode());
+    }
 }
 
 void AbstractFormEditorTool::showContextMenu(QGraphicsSceneMouseEvent *event)