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diff --git a/src/corelib/kernel/qpropertybinding_p.h b/src/corelib/kernel/qpropertybinding_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 QPROPERTYBINDING_P_H
+#define QPROPERTYBINDING_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 <QtCore/qglobal.h>
+#include <QtCore/qshareddata.h>
+#include <QtCore/qscopedpointer.h>
+#include <vector>
+#include <functional>
+
+#include "qproperty_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QPropertyBindingPrivate : public QSharedData
+{
+private:
+    friend struct QPropertyBasePointer;
+
+    QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction;
+
+    QPropertyObserverPointer firstObserver;
+    std::array<QPropertyObserver, 4> inlineDependencyObservers;
+    QScopedPointer<std::vector<QPropertyObserver>> heapObservers;
+
+    void *propertyDataPtr = nullptr;
+
+    QPropertyBindingSourceLocation location;
+    QPropertyBindingError error;
+
+    QMetaType metaType;
+
+    bool dirty = false;
+    bool updating = false;
+
+public:
+    // public because the auto-tests access it, too.
+    size_t dependencyObserverCount = 0;
+
+    QPropertyBindingPrivate(const QMetaType &metaType, QUntypedPropertyBinding::BindingEvaluationFunction evaluationFunction,
+                            const QPropertyBindingSourceLocation &location)
+        : evaluationFunction(std::move(evaluationFunction))
+        , location(location)
+        , metaType(metaType)
+    {}
+    virtual ~QPropertyBindingPrivate();
+
+    void setDirty(bool d) { dirty = d; }
+    void setProperty(void *propertyPtr) { propertyDataPtr = propertyPtr; }
+    void prependObserver(QPropertyObserverPointer observer) {
+        observer.ptr->prev = const_cast<QPropertyObserver **>(&firstObserver.ptr);
+        firstObserver = observer;
+    }
+
+    void clearDependencyObservers() {
+        for (size_t i = 0; i < inlineDependencyObservers.size(); ++i) {
+            QPropertyObserver empty;
+            qSwap(inlineDependencyObservers[i], empty);
+        }
+        if (heapObservers)
+            heapObservers->clear();
+        dependencyObserverCount = 0;
+    }
+    QPropertyObserverPointer allocateDependencyObserver() {
+        if (dependencyObserverCount < inlineDependencyObservers.size()) {
+            ++dependencyObserverCount;
+            return {&inlineDependencyObservers[dependencyObserverCount - 1]};
+        }
+        ++dependencyObserverCount;
+        if (!heapObservers)
+            heapObservers.reset(new std::vector<QPropertyObserver>());
+        return {&heapObservers->emplace_back()};
+    }
+
+    QPropertyBindingSourceLocation sourceLocation() const { return location; }
+    QPropertyBindingError bindingError() const { return error; }
+    QMetaType valueMetaType() const { return metaType; }
+
+    void unlinkAndDeref();
+
+    void markDirtyAndNotifyObservers();
+    bool evaluateIfDirtyAndReturnTrueIfValueChanged();
+
+    static QPropertyBindingPrivate *get(const QUntypedPropertyBinding &binding)
+    { return binding.d.data(); }
+};
+
+QT_END_NAMESPACE
+
+#endif // QPROPERTYBINDING_P_H