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diff --git a/src/quicktemplates/qquickstackelement_p_p.h b/src/quicktemplates/qquickstackelement_p_p.h
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+++ b/src/quicktemplates/qquickstackelement_p_p.h
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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQUICKSTACKELEMENT_P_P_H
+#define QQUICKSTACKELEMENT_P_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtQuickTemplates2/private/qquickstackview_p.h>
+#include <QtQuickTemplates2/private/qquickcontrol_p_p.h>
+#if QT_CONFIG(quick_viewtransitions)
+#include <QtQuick/private/qquickitemviewtransition_p.h>
+#endif
+#include <QtQuick/private/qquickitemchangelistener_p.h>
+#include <QtQml/private/qv4persistent_p.h>
+
+#include <QtCore/qpointer.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQmlContext;
+class QQmlComponent;
+struct QQuickStackTransition;
+class RequiredProperties;
+
+class QQuickStackElement :
+#if QT_CONFIG(quick_viewtransitions)
+        public QQuickItemViewTransitionableItem,
+#endif
+        public QQuickItemChangeListener
+{
+    QQuickStackElement();
+
+public:
+    ~QQuickStackElement();
+
+    static QQuickStackElement *fromString(const QString &str, QQuickStackView *view, QString *error);
+    static QQuickStackElement *fromObject(QObject *object, QQuickStackView *view, QString *error);
+    static QQuickStackElement *fromStackViewArg(QQuickStackView *view, QQuickStackViewArg arg);
+
+    bool load(QQuickStackView *parent);
+    void incubate(QObject *object, RequiredProperties *requiredProperties);
+    void initialize(RequiredProperties *requiredProperties);
+
+    void setIndex(int index);
+    void setView(QQuickStackView *view);
+    void setStatus(QQuickStackView::Status status);
+    void setVisible(bool visible);
+
+#if QT_CONFIG(quick_viewtransitions)
+    void transitionNextReposition(QQuickItemViewTransitioner *transitioner, QQuickItemViewTransitioner::TransitionType type, bool asTarget);
+    bool prepareTransition(QQuickItemViewTransitioner *transitioner, const QRectF &viewBounds);
+    void startTransition(QQuickItemViewTransitioner *transitioner, QQuickStackView::Status status);
+    void completeTransition(QQuickTransition *quickTransition);
+#endif
+
+    void itemDestroyed(QQuickItem *item) override;
+
+    int index = -1;
+    bool init = false;
+    bool removal = false;
+    bool ownItem = false;
+    bool ownComponent = false;
+    bool widthValid = false;
+    bool heightValid = false;
+    QQmlComponent *component = nullptr;
+    QQuickStackView *view = nullptr;
+    QPointer<QQuickItem> originalParent;
+    QQuickStackView::Status status = QQuickStackView::Inactive;
+    QV4::PersistentValue properties;
+    QV4::PersistentValue qmlCallingContext;
+#if !QT_CONFIG(quick_viewtransitions)
+    QQuickItem *item;
+#endif
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKSTACKELEMENT_P_P_H