From ff4f5133daacf7282493753d6336ef5c22185fed Mon Sep 17 00:00:00 2001
From: Thomas Hartmann <thomas.hartmann@qt.io>
Date: Mon, 22 Apr 2024 17:43:08 +0200
Subject: [PATCH] QmlDesigner: Set proper engine ownership

Change-Id: I603cb34209a231226f1ef7ccb269ab8813f2758d
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
---
 src/plugins/qmldesigner/components/componentcore/theme.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/plugins/qmldesigner/components/componentcore/theme.cpp b/src/plugins/qmldesigner/components/componentcore/theme.cpp
index af495fd3b56..ef618447e71 100644
--- a/src/plugins/qmldesigner/components/componentcore/theme.cpp
+++ b/src/plugins/qmldesigner/components/componentcore/theme.cpp
@@ -10,6 +10,7 @@
 
 #include <utils/stylehelper.h>
 
+#include <qqml.h>
 #include <QApplication>
 #include <QMainWindow>
 #include <QPointer>
@@ -18,7 +19,7 @@
 #include <QQmlProperty>
 #include <QRegularExpression>
 #include <QScreen>
-#include <qqml.h>
+#include <QWindow>
 
 static Q_LOGGING_CATEGORY(themeLog, "qtc.qmldesigner.theme", QtWarningMsg)
 
@@ -140,7 +141,9 @@ bool Theme::highPixelDensity() const
 
 QWindow *Theme::mainWindowHandle() const
 {
-    return Core::ICore::mainWindow()->windowHandle();
+    QWindow *handle = Core::ICore::mainWindow()->windowHandle();
+    QQmlEngine::setObjectOwnership(handle, QJSEngine::CppOwnership);
+    return handle;
 }
 
 QPixmap Theme::getPixmap(const QString &id)