fix #16849: Set ownership of PopupView::m_contentItem

Items created in QML are managed by the QML engine, so they can't be deleted from C++ code. The destructor of PopupView deletes the object and it should delete only objects with Cpp ownership.

src/framework/uicomponents/view/popupview.cpp

@@ -59,7 +59,10 @@ PopupView::~PopupView()
     if (m_window) {
         m_window->setOnHidden(std::function<void()>());
     }
-    m_contentItem->deleteLater();
+
+    if (QQmlEngine::objectOwnership(m_contentItem) == QQmlEngine::CppOwnership) {
+        m_contentItem->deleteLater();
+    }
 
     if (m_closeController) {
         delete m_closeController;