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diff --git a/framework/inc/helper/tagwindowasmodified.hxx b/framework/inc/helper/tagwindowasmodified.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_FRAMEWORK_INC_HELPER_TAGWINDOWASMODIFIED_HXX
+#define INCLUDED_FRAMEWORK_INC_HELPER_TAGWINDOWASMODIFIED_HXX
+
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/frame/XFrame.hpp>
+#include <com/sun/star/util/XModifyListener.hpp>
+#include <com/sun/star/frame/XFrameActionListener.hpp>
+
+#include <cppuhelper/implbase.hxx>
+#include <cppuhelper/weakref.hxx>
+
+namespace framework{
+
+/*-************************************************************************************************************
+    @short          listen for modify events on model and tag frame container window so it can react accordingly
+    @descr          Used e.g. by our MAC port where such state is shown separately on some controls of the
+                    title bar.
+
+    @base           OWeakObject
+                        implements ref counting for this class.
+
+    @devstatus      draft
+    @threadsafe     yes
+*//*-*************************************************************************************************************/
+class TagWindowAsModified final : public  ::cppu::WeakImplHelper<
+                                          css::lang::XInitialization,
+                                          css::frame::XFrameActionListener, // => XEventListener
+                                          css::util::XModifyListener >       // => XEventListener
+{
+
+    // member
+
+    private:
+
+        /// reference to the frame, where we listen for new loaded documents for updating our own xModel reference
+        css::uno::WeakReference< css::frame::XFrame > m_xFrame;
+
+        /// reference to the frame container window, where we must set the tag
+        css::uno::WeakReference< css::awt::XWindow > m_xWindow;
+
+        /// we list on the model for modify events
+        css::uno::WeakReference< css::frame::XModel > m_xModel;
+
+    // interface
+
+    public:
+
+        // ctor/dtor
+                 TagWindowAsModified();
+        virtual ~TagWindowAsModified(                                                                   ) override;
+
+        // XInterface, XTypeProvider
+
+        // XInitialization
+        virtual void SAL_CALL initialize(const css::uno::Sequence< css::uno::Any >& lArguments) override;
+
+        // XModifyListener
+        virtual void SAL_CALL modified(const css::lang::EventObject& aEvent) override;
+
+        // XFrameActionListener
+        virtual void SAL_CALL frameAction(const css::frame::FrameActionEvent& aEvent) override;
+
+        // XEventListener
+        virtual void SAL_CALL disposing(const css::lang::EventObject& aEvent) override;
+
+    private:
+
+        // @todo document me
+        void impl_update(const css::uno::Reference< css::frame::XFrame >& xFrame);
+
+}; // class TagWindowAsModified
+
+} // namespace framework
+
+#endif // INCLUDED_FRAMEWORK_INC_HELPER_TAGWINDOWASMODIFIED_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */