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diff --git a/chart2/source/inc/ChartViewHelper.hxx b/chart2/source/inc/ChartViewHelper.hxx
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+++ b/chart2/source/inc/ChartViewHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "charttoolsdllapi.hxx"
+#include <rtl/ref.hxx>
+
+#include <com/sun/star/uno/Reference.hxx>
+
+namespace com::sun::star::chart2
+{
+class XChartDocument;
+}
+
+namespace chart
+{
+class ChartModel;
+
+namespace ChartViewHelper
+{
+OOO_DLLPUBLIC_CHARTTOOLS void setViewToDirtyState(const rtl::Reference<ChartModel>& xChartModel);
+OOO_DLLPUBLIC_CHARTTOOLS void
+setViewToDirtyState_UNO(const css::uno::Reference<css::chart2::XChartDocument>& xChartModel);
+};
+
+} //namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */