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diff --git a/sd/inc/undo/undomanager.hxx b/sd/inc/undo/undomanager.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_INC_UNDO_UNDOMANAGER_HXX
+#define INCLUDED_SD_INC_UNDO_UNDOMANAGER_HXX
+
+#include <svx/sdrundomanager.hxx>
+#include <sddllapi.h>
+
+namespace sd
+{
+
+class UndoManager final : public SdrUndoManager
+{
+public:
+    UndoManager();
+
+    virtual void            EnterListAction(const OUString &rComment, const OUString& rRepeatComment, sal_uInt16 nId, ViewShellId nViewShellId) override;
+
+    virtual void            AddUndoAction( std::unique_ptr<SfxUndoAction> pAction, bool bTryMerg=false ) override;
+
+    /** Set or reset the undo manager linked with the called undo manager.
+    */
+    void SetLinkedUndoManager (SfxUndoManager* pLinkedUndoManager);
+
+private:
+    using SdrUndoManager::Undo;
+    using SdrUndoManager::Redo;
+
+    /** Used when the outline view is visible as a last resort to
+        synchronize the undo managers.
+    */
+    SfxUndoManager* mpLinkedUndoManager;
+
+    /** Call ClearRedo() at the linked undo manager, when present.
+
+        It should not be necessary to call ClearRedo() explicitly, but the
+        synchronization between the under managers of the document and the
+        outline view seems to have a bug.  Therefore this method is called
+        whenever a new undo action is added.
+    */
+    void ClearLinkedRedoActions();
+};
+
+}
+
+#endif // INCLUDED_SD_INC_UNDO_UNDOMANAGER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */