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diff --git a/sfx2/source/doc/docundomanager.cxx b/sfx2/source/doc/docundomanager.cxx
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+++ b/sfx2/source/doc/docundomanager.cxx
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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 .
+ */
+
+
+#include <docundomanager.hxx>
+#include <sfx2/sfxbasemodel.hxx>
+#include <sfx2/objsh.hxx>
+#include <sfx2/viewfrm.hxx>
+#include <sfx2/viewsh.hxx>
+#include <sfx2/bindings.hxx>
+#include <sfx2/sfxsids.hrc>
+#include <com/sun/star/lang/NoSupportException.hpp>
+#include <com/sun/star/lang/NotInitializedException.hpp>
+#include <svl/undo.hxx>
+#include <tools/diagnose_ex.h>
+#include <framework/undomanagerhelper.hxx>
+#include <framework/imutex.hxx>
+
+
+namespace sfx2
+{
+
+
+    using ::com::sun::star::uno::Reference;
+    using ::com::sun::star::uno::XInterface;
+    using ::com::sun::star::uno::RuntimeException;
+    using ::com::sun::star::uno::Sequence;
+    using ::com::sun::star::document::XUndoAction;
+    using ::com::sun::star::lang::NotInitializedException;
+    using ::com::sun::star::document::XUndoManagerListener;
+    using ::com::sun::star::document::XUndoManager;
+    using ::com::sun::star::lang::NoSupportException;
+    using ::com::sun::star::frame::XModel;
+
+    //= DocumentUndoManager_Impl
+
+    struct DocumentUndoManager_Impl : public ::framework::IUndoManagerImplementation
+    {
+        DocumentUndoManager&                rAntiImpl;
+        SfxUndoManager*                     pUndoManager;
+        ::framework::UndoManagerHelper      aUndoHelper;
+
+        explicit DocumentUndoManager_Impl( DocumentUndoManager& i_antiImpl )
+            :rAntiImpl( i_antiImpl )
+            ,pUndoManager( impl_retrieveUndoManager( i_antiImpl.getBaseModel() ) )
+                // do this *before* the construction of aUndoHelper (which actually means: put pUndoManager before
+                // aUndoHelper in the member list)!
+            ,aUndoHelper( *this )
+        {
+        }
+
+        virtual ~DocumentUndoManager_Impl()
+        {
+        };
+
+        // IUndoManagerImplementation
+        virtual SfxUndoManager&        getImplUndoManager() override;
+        virtual Reference< XUndoManager >   getThis() override;
+
+        void disposing()
+        {
+            aUndoHelper.disposing();
+            ENSURE_OR_RETURN_VOID( pUndoManager, "DocumentUndoManager_Impl::disposing: already disposed!" );
+            pUndoManager = nullptr;
+        }
+
+        void invalidateXDo_nolck();
+
+    private:
+        static SfxUndoManager* impl_retrieveUndoManager( SfxBaseModel& i_baseModel )
+        {
+            SfxUndoManager* pUndoManager( nullptr );
+            SfxObjectShell* pObjectShell = i_baseModel.GetObjectShell();
+            if ( pObjectShell != nullptr )
+                pUndoManager = pObjectShell->GetUndoManager();
+            if ( !pUndoManager )
+                throw NotInitializedException( OUString(), i_baseModel );
+            return pUndoManager;
+        }
+    };
+
+
+    SfxUndoManager& DocumentUndoManager_Impl::getImplUndoManager()
+    {
+        ENSURE_OR_THROW( pUndoManager != nullptr, "DocumentUndoManager_Impl::getImplUndoManager: no access to the doc's UndoManager implementation!" );
+
+#if OSL_DEBUG_LEVEL > 0
+        // in a non-product build, assert if the current UndoManager at the shell is not the same we obtained
+        // (and cached) at construction time
+        SfxObjectShell* pObjectShell = rAntiImpl.getBaseModel().GetObjectShell();
+        OSL_ENSURE( ( pObjectShell != nullptr ) && ( pUndoManager == pObjectShell->GetUndoManager() ),
+            "DocumentUndoManager_Impl::getImplUndoManager: the UndoManager changed meanwhile - what about our listener?" );
+#endif
+
+        return *pUndoManager;
+    }
+
+
+    Reference< XUndoManager > DocumentUndoManager_Impl::getThis()
+    {
+        return static_cast< XUndoManager* >( &rAntiImpl );
+    }
+
+
+    void DocumentUndoManager_Impl::invalidateXDo_nolck()
+    {
+        SfxModelGuard aGuard( rAntiImpl );
+
+        const SfxObjectShell* pDocShell = rAntiImpl.getBaseModel().GetObjectShell();
+        ENSURE_OR_THROW( pDocShell != nullptr, "lcl_invalidateUndo: no access to the doc shell!" );
+        SfxViewFrame* pViewFrame = SfxViewFrame::GetFirst( pDocShell );
+        while ( pViewFrame )
+        {
+            pViewFrame->GetBindings().Invalidate( SID_UNDO );
+            pViewFrame->GetBindings().Invalidate( SID_REDO );
+            pViewFrame = SfxViewFrame::GetNext( *pViewFrame, pDocShell );
+        }
+    }
+
+
+    //= SolarMutexFacade
+
+    namespace {
+
+    /** a facade for the SolarMutex, implementing ::framework::IMutex
+    */
+    class SolarMutexFacade : public ::framework::IMutex
+    {
+    public:
+        SolarMutexFacade()
+        {
+        }
+
+        virtual ~SolarMutexFacade() {}
+
+        virtual void acquire() override
+        {
+            Application::GetSolarMutex().acquire();
+        }
+
+        virtual void release() override
+        {
+            Application::GetSolarMutex().release();
+        }
+    };
+
+
+    //= UndoManagerGuard
+
+    class UndoManagerGuard  :public ::framework::IMutexGuard
+    {
+    public:
+        explicit UndoManagerGuard( DocumentUndoManager& i_undoManager )
+            :m_guard( i_undoManager )
+            ,m_solarMutexFacade()
+        {
+        }
+
+        virtual ~UndoManagerGuard()
+        {
+        }
+
+        UndoManagerGuard(const UndoManagerGuard&) = delete;
+        UndoManagerGuard& operator=(const UndoManagerGuard&) = delete;
+
+        virtual void clear() override
+        {
+            m_guard.clear();
+        }
+
+        virtual ::framework::IMutex& getGuardedMutex() override
+        {
+            // note that this means that we *know* that SfxModelGuard also locks the SolarMutex (nothing more, nothing less).
+            // If this ever changes, we need to adjust this code here, too.
+            return m_solarMutexFacade;
+        }
+
+    private:
+        SfxModelGuard       m_guard;
+        SolarMutexFacade    m_solarMutexFacade;
+    };
+
+    }
+
+    //= DocumentUndoManager
+
+
+    DocumentUndoManager::DocumentUndoManager( SfxBaseModel& i_document )
+        :SfxModelSubComponent( i_document )
+        ,m_pImpl( new DocumentUndoManager_Impl( *this ) )
+    {
+    }
+
+    DocumentUndoManager::~DocumentUndoManager()
+    {
+    }
+
+    void DocumentUndoManager::disposing()
+    {
+        m_pImpl->disposing();
+    }
+
+
+    bool DocumentUndoManager::isInContext() const
+    {
+        // No mutex locking within this method, no disposal check - this is the responsibility of the owner.
+        return m_pImpl->getImplUndoManager().IsInListAction();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::acquire() throw()
+    {
+        OWeakObject::acquire();
+        SfxModelSubComponent::acquireModel();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::release() throw()
+    {
+        SfxModelSubComponent::releaseModel();
+        OWeakObject::release();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::enterUndoContext( const OUString& i_title )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.enterUndoContext( i_title, aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::enterHiddenUndoContext(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.enterHiddenUndoContext( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::leaveUndoContext(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.leaveUndoContext( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::addUndoAction( const Reference< XUndoAction >& i_action )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.addUndoAction( i_action, aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::undo(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.undo( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::redo(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.redo( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    sal_Bool SAL_CALL DocumentUndoManager::isUndoPossible(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.isUndoPossible();
+    }
+
+
+    sal_Bool SAL_CALL DocumentUndoManager::isRedoPossible(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.isRedoPossible();
+    }
+
+
+    OUString SAL_CALL DocumentUndoManager::getCurrentUndoActionTitle(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.getCurrentUndoActionTitle();
+    }
+
+
+    OUString SAL_CALL DocumentUndoManager::getCurrentRedoActionTitle(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.getCurrentRedoActionTitle();
+    }
+
+
+    Sequence< OUString > SAL_CALL DocumentUndoManager::getAllUndoActionTitles(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.getAllUndoActionTitles();
+    }
+
+
+    Sequence< OUString > SAL_CALL DocumentUndoManager::getAllRedoActionTitles(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.getAllRedoActionTitles();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::clear(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.clear( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::clearRedo(  )
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.clearRedo( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::reset()
+    {
+        // SYNCHRONIZED --->
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.reset( aGuard );
+        // <--- SYNCHRONIZED
+        m_pImpl->invalidateXDo_nolck();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::lock(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.lock();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::unlock(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        m_pImpl->aUndoHelper.unlock();
+    }
+
+
+    sal_Bool SAL_CALL DocumentUndoManager::isLocked(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.isLocked();
+    }
+
+
+    void SAL_CALL DocumentUndoManager::addUndoManagerListener( const Reference< XUndoManagerListener >& i_listener )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.addUndoManagerListener( i_listener );
+    }
+
+
+    void SAL_CALL DocumentUndoManager::removeUndoManagerListener( const Reference< XUndoManagerListener >& i_listener )
+    {
+        UndoManagerGuard aGuard( *this );
+        return m_pImpl->aUndoHelper.removeUndoManagerListener( i_listener );
+    }
+
+
+    Reference< XInterface > SAL_CALL DocumentUndoManager::getParent(  )
+    {
+        UndoManagerGuard aGuard( *this );
+        return static_cast< XModel* >( &getBaseModel() );
+    }
+
+
+    void SAL_CALL DocumentUndoManager::setParent( const Reference< XInterface >& )
+    {
+        throw NoSupportException( OUString(), m_pImpl->getThis() );
+    }
+
+
+} // namespace sfx2
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */