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diff --git a/src/corelib/kernel/qproperty_p.h b/src/corelib/kernel/qproperty_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QPROPERTY_P_H
+#define QPROPERTY_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <qglobal.h>
+#include <qvarlengtharray.h>
+
+#include "qproperty.h"
+
+QT_BEGIN_NAMESPACE
+
+// This is a helper "namespace"
+struct Q_AUTOTEST_EXPORT QPropertyBasePointer
+{
+    const QtPrivate::QPropertyBase *ptr = nullptr;
+
+    QPropertyBindingPrivate *bindingPtr() const;
+
+    void addObserver(QPropertyObserver *observer);
+    void setFirstObserver(QPropertyObserver *observer);
+    QPropertyObserverPointer firstObserver() const;
+
+    int observerCount() const;
+
+    template <typename T>
+    static QPropertyBasePointer get(QProperty<T> &property)
+    {
+        return QPropertyBasePointer{&property.d.priv};
+    }
+};
+
+// This is a helper "namespace"
+struct QPropertyObserverPointer
+{
+    QPropertyObserver *ptr = nullptr;
+
+    void unlink();
+
+    void setBindingToMarkDirty(QPropertyBindingPrivate *binding);
+    void setChangeHandler(void (*changeHandler)(QPropertyObserver *, void *));
+
+    void notify(QPropertyBindingPrivate *triggeringBinding, void *propertyDataPtr);
+    void observeProperty(QPropertyBasePointer property);
+
+    explicit operator bool() const { return ptr != nullptr; }
+
+    QPropertyObserverPointer nextObserver() const { return {ptr->next.data()}; }
+};
+
+class QPropertyBindingErrorPrivate : public QSharedData
+{
+public:
+    QPropertyBindingError::Type type = QPropertyBindingError::NoError;
+    QString description;
+    QPropertyBindingSourceLocation location;
+};
+
+struct BindingEvaluationState
+{
+    BindingEvaluationState(QPropertyBindingPrivate *binding);
+    ~BindingEvaluationState();
+    QPropertyBindingPrivate *binding;
+    BindingEvaluationState *previousState = nullptr;
+};
+
+QT_END_NAMESPACE
+
+#endif // QPROPERTY_P_H