models returned by ViewManager will be deleted by QQmlEngine

sets explicitly QQmlEngine::JavaScriptOwnership for models created by
ViewManager and returned to qml

once they are no longer referenced by qml, they will be automatically
deleted

src/viewmanager.cpp

@@ -16,6 +16,8 @@
 
 #include <KI18n/KLocalizedString>
 
+#include <QQmlEngine>
+
 class ViewManagerPrivate
 {
 public:
@@ -229,6 +231,9 @@ void ViewManager::openViewFromData(const ViewParameters &viewParamaters)
         break;
     }
 
+    QQmlEngine::setObjectOwnership(newModel, QQmlEngine::JavaScriptOwnership);
+    QQmlEngine::setObjectOwnership(proxyModel, QQmlEngine::JavaScriptOwnership);
+
     d->mViewParametersStack.push_back(viewParamaters);
     switch (viewParamaters.mViewPresentationType)
     {