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diff --git a/sd/source/ui/inc/unchss.hxx b/sd/source/ui/inc/unchss.hxx
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+++ b/sd/source/ui/inc/unchss.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 .
+ */
+
+#ifndef INCLUDED_SD_SOURCE_UI_INC_UNCHSS_HXX
+#define INCLUDED_SD_SOURCE_UI_INC_UNCHSS_HXX
+
+#include <memory>
+
+#include <svl/itemset.hxx>
+
+#include <sdundo.hxx>
+
+class SfxItemSet;
+class SfxStyleSheet;
+class SdDrawDocument;
+
+class StyleSheetUndoAction : public SdUndoAction
+{
+    SfxStyleSheet*  mpStyleSheet;
+
+    std::unique_ptr<SfxItemSet> mpNewSet;
+    std::unique_ptr<SfxItemSet> mpOldSet;
+
+public:
+    StyleSheetUndoAction(SdDrawDocument* pTheDoc,
+                         SfxStyleSheet*  pTheStyleSheet,
+                         const SfxItemSet* pTheNewItemSet);
+
+    virtual void Undo() override;
+    virtual void Redo() override;
+};
+
+#endif // INCLUDED_SD_SOURCE_UI_INC_UNCHSS_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */