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diff --git a/vcl/source/edit/textundo.cxx b/vcl/source/edit/textundo.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 "textundo.hxx"
+#include "textund2.hxx"
+#include <strings.hrc>
+
+#include <sal/log.hxx>
+#include <vcl/texteng.hxx>
+#include <vcl/textview.hxx>
+#include <vcl/textdata.hxx>
+#include "textdoc.hxx"
+#include "textdat2.hxx"
+#include <svdata.hxx>
+
+namespace
+{
+
+// Shorten() -- inserts ellipsis (...) in the middle of a long text
+void Shorten (OUString& rString)
+{
+ auto const nLen = rString.getLength();
+ if (nLen <= 48)
+ return;
+
+ // If possible, we don't break a word, hence first we look for a space.
+ // Space before the ellipsis:
+ auto iFirst = rString.lastIndexOf(' ', 32);
+ if (iFirst == -1 || iFirst < 16)
+ iFirst = 24; // not possible
+ // Space after the ellipsis:
+ auto iLast = rString.indexOf(' ', nLen - 16);
+ if (iLast == -1 || iLast > nLen - 4)
+ iLast = nLen - 8; // not possible
+ // finally:
+ rString =
+ OUString::Concat(rString.subView(0, iFirst + 1)) +
+ "..." +
+ rString.subView(iLast);
+}
+
+} // namespace
+
+TextUndoManager::TextUndoManager( TextEngine* p )
+{
+ mpTextEngine = p;
+}
+
+TextUndoManager::~TextUndoManager()
+{
+}
+
+bool TextUndoManager::Undo()
+{
+ if ( GetUndoActionCount() == 0 )
+ return false;
+
+ UndoRedoStart();
+
+ mpTextEngine->SetIsInUndo( true );
+ bool bDone = SfxUndoManager::Undo();
+ mpTextEngine->SetIsInUndo( false );
+
+ UndoRedoEnd();
+
+ return bDone;
+}
+
+bool TextUndoManager::Redo()
+{
+ if ( GetRedoActionCount() == 0 )
+ return false;
+
+ UndoRedoStart();
+
+ mpTextEngine->SetIsInUndo( true );
+ bool bDone = SfxUndoManager::Redo();
+ mpTextEngine->SetIsInUndo( false );
+
+ UndoRedoEnd();
+
+ return bDone;
+}
+
+void TextUndoManager::UndoRedoStart()
+{
+ SAL_WARN_IF( !GetView(), "vcl", "Undo/Redo: Active View?" );
+}
+
+void TextUndoManager::UndoRedoEnd()
+{
+ if ( GetView() )
+ {
+ TextSelection aNewSel( GetView()->GetSelection() );
+ aNewSel.GetStart() = aNewSel.GetEnd();
+ GetView()->ImpSetSelection( aNewSel );
+ }
+
+ mpTextEngine->FormatAndUpdate( GetView() );
+}
+
+TextUndo::TextUndo( TextEngine* p )
+{
+ mpTextEngine = p;
+}
+
+TextUndo::~TextUndo()
+{
+}
+
+OUString TextUndo::GetComment() const
+{
+ return OUString();
+}
+
+void TextUndo::SetSelection( const TextSelection& rSel )
+{
+ if ( GetView() )
+ GetView()->ImpSetSelection( rSel );
+}
+
+TextUndoDelPara::TextUndoDelPara( TextEngine* pTextEngine, TextNode* pNode, sal_uInt32 nPara )
+ : TextUndo( pTextEngine )
+ , mbDelObject( true)
+ , mnPara( nPara )
+ , mpNode( pNode )
+{
+}
+
+TextUndoDelPara::~TextUndoDelPara()
+{
+ if ( mbDelObject )
+ delete mpNode;
+}
+
+void TextUndoDelPara::Undo()
+{
+ GetTextEngine()->InsertContent( std::unique_ptr<TextNode>(mpNode), mnPara );
+ mbDelObject = false; // belongs again to the engine
+
+ if ( GetView() )
+ {
+ TextSelection aSel( TextPaM( mnPara, 0 ), TextPaM( mnPara, mpNode->GetText().getLength() ) );
+ SetSelection( aSel );
+ }
+}
+
+void TextUndoDelPara::Redo()
+{
+ auto & rDocNodes = GetDoc()->GetNodes();
+ // pNode is not valid anymore in case an Undo joined paragraphs
+ mpNode = rDocNodes[ mnPara ].get();
+
+ GetTEParaPortions()->Remove( mnPara );
+
+ // do not delete Node because of Undo!
+ auto it = ::std::find_if( rDocNodes.begin(), rDocNodes.end(),
+ [&] (std::unique_ptr<TextNode> const & p) { return p.get() == mpNode; } );
+ assert(it != rDocNodes.end());
+ it->release();
+ GetDoc()->GetNodes().erase( it );
+
+ GetTextEngine()->ImpParagraphRemoved( mnPara );
+
+ mbDelObject = true; // belongs again to the Undo
+
+ const sal_uInt32 nParas = static_cast<sal_uInt32>(GetDoc()->GetNodes().size());
+ const sal_uInt32 n = mnPara < nParas ? mnPara : nParas-1;
+ TextNode* pN = GetDoc()->GetNodes()[ n ].get();
+ TextPaM aPaM( n, pN->GetText().getLength() );
+ SetSelection( aPaM );
+}
+
+OUString TextUndoDelPara::GetComment () const
+{
+ return VclResId(STR_TEXTUNDO_DELPARA);
+}
+
+TextUndoConnectParas::TextUndoConnectParas( TextEngine* pTextEngine, sal_uInt32 nPara, sal_Int32 nPos )
+ : TextUndo( pTextEngine )
+ , mnPara( nPara )
+ , mnSepPos( nPos )
+{
+}
+
+TextUndoConnectParas::~TextUndoConnectParas()
+{
+}
+
+void TextUndoConnectParas::Undo()
+{
+ TextPaM aPaM = GetTextEngine()->SplitContent( mnPara, mnSepPos );
+ SetSelection( aPaM );
+}
+
+void TextUndoConnectParas::Redo()
+{
+ TextPaM aPaM = GetTextEngine()->ConnectContents( mnPara );
+ SetSelection( aPaM );
+}
+
+OUString TextUndoConnectParas::GetComment () const
+{
+ return VclResId(STR_TEXTUNDO_CONNECTPARAS);
+}
+
+TextUndoSplitPara::TextUndoSplitPara( TextEngine* pTextEngine, sal_uInt32 nPara, sal_Int32 nPos )
+ : TextUndo( pTextEngine )
+ , mnPara( nPara )
+ , mnSepPos ( nPos )
+{
+}
+
+TextUndoSplitPara::~TextUndoSplitPara()
+{
+}
+
+void TextUndoSplitPara::Undo()
+{
+ TextPaM aPaM = GetTextEngine()->ConnectContents( mnPara );
+ SetSelection( aPaM );
+}
+
+void TextUndoSplitPara::Redo()
+{
+ TextPaM aPaM = GetTextEngine()->SplitContent( mnPara, mnSepPos );
+ SetSelection( aPaM );
+}
+
+OUString TextUndoSplitPara::GetComment () const
+{
+ return VclResId(STR_TEXTUNDO_SPLITPARA);
+}
+
+TextUndoInsertChars::TextUndoInsertChars( TextEngine* pTextEngine, const TextPaM& rTextPaM, const OUString& rStr )
+ : TextUndo( pTextEngine ),
+ maTextPaM( rTextPaM ), maText( rStr )
+{
+}
+
+void TextUndoInsertChars::Undo()
+{
+ TextSelection aSel( maTextPaM, maTextPaM );
+ aSel.GetEnd().GetIndex() += maText.getLength();
+ TextPaM aPaM = GetTextEngine()->ImpDeleteText( aSel );
+ SetSelection( aPaM );
+}
+
+void TextUndoInsertChars::Redo()
+{
+ TextSelection aSel( maTextPaM, maTextPaM );
+ GetTextEngine()->ImpInsertText( aSel, maText );
+ TextPaM aNewPaM( maTextPaM );
+ aNewPaM.GetIndex() += maText.getLength();
+ SetSelection( TextSelection( aSel.GetStart(), aNewPaM ) );
+}
+
+bool TextUndoInsertChars::Merge( SfxUndoAction* pNextAction )
+{
+ TextUndoInsertChars* pNext = dynamic_cast<TextUndoInsertChars*>(pNextAction);
+ if ( !pNext )
+ return false;
+
+ if ( maTextPaM.GetPara() != pNext->maTextPaM.GetPara() )
+ return false;
+
+ if ( ( maTextPaM.GetIndex() + maText.getLength() ) == pNext->maTextPaM.GetIndex() )
+ {
+ maText += pNext->maText;
+ return true;
+ }
+ return false;
+}
+
+OUString TextUndoInsertChars::GetComment () const
+{
+ // multiple lines?
+ OUString sText(maText);
+ Shorten(sText);
+ return VclResId(STR_TEXTUNDO_INSERTCHARS).replaceAll("$1", sText);
+}
+
+TextUndoRemoveChars::TextUndoRemoveChars( TextEngine* pTextEngine, const TextPaM& rTextPaM, const OUString& rStr )
+ : TextUndo( pTextEngine ),
+ maTextPaM( rTextPaM ), maText( rStr )
+{
+}
+
+void TextUndoRemoveChars::Undo()
+{
+ TextSelection aSel( maTextPaM, maTextPaM );
+ GetTextEngine()->ImpInsertText( aSel, maText );
+ aSel.GetEnd().GetIndex() += maText.getLength();
+ SetSelection( aSel );
+}
+
+void TextUndoRemoveChars::Redo()
+{
+ TextSelection aSel( maTextPaM, maTextPaM );
+ aSel.GetEnd().GetIndex() += maText.getLength();
+ TextPaM aPaM = GetTextEngine()->ImpDeleteText( aSel );
+ SetSelection( aPaM );
+}
+
+OUString TextUndoRemoveChars::GetComment () const
+{
+ // multiple lines?
+ OUString sText(maText);
+ Shorten(sText);
+ return VclResId(STR_TEXTUNDO_REMOVECHARS).replaceAll("$1", sText);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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