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diff --git a/tools/linguist/lupdate/merge.cpp b/tools/linguist/lupdate/merge.cpp
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+++ b/tools/linguist/lupdate/merge.cpp
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+/**********************************************************************
+** Copyright (C) 2005-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of Qt Linguist.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free Qt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing requirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at sales@trolltech.com.
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with
+** the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include <metatranslator.h>
+
+// defined in numberh.cpp
+extern void applyNumberHeuristic( MetaTranslator *tor, bool verbose );
+// defined in sametexth.cpp
+extern void applySameTextHeuristic( MetaTranslator *tor, bool verbose );
+
+typedef QValueList<MetaTranslatorMessage> TML;
+
+/*
+  Merges two MetaTranslator objects into the first one. The first one
+  is a set of source texts and translations for a previous version of
+  the internationalized program; the second one is a set of fresh
+  source texts newly extracted from the source code, without any
+  translation yet.
+*/
+
+void merge( MetaTranslator *tor, const MetaTranslator *virginTor, bool verbose )
+{
+    int known = 0;
+    int neww = 0;
+    int obsoleted = 0;
+    TML all = tor->messages();
+    TML::Iterator it;
+
+    /*
+      The types of all the messages from the vernacular translator
+      are updated according to the virgin translator.
+    */
+    for ( it = all.begin(); it != all.end(); ++it ) {
+	MetaTranslatorMessage::Type newType;
+	MetaTranslatorMessage m = *it;
+
+	// skip context comment
+	if ( !QCString((*it).sourceText()).isEmpty() ) {
+	    if ( !virginTor->contains((*it).context(), (*it).sourceText(),
+				      (*it).comment()) ) {
+		newType = MetaTranslatorMessage::Obsolete;
+		if ( m.type() != MetaTranslatorMessage::Obsolete )
+		    obsoleted++;
+	    } else {
+		switch ( m.type() ) {
+		case MetaTranslatorMessage::Finished:
+		    newType = MetaTranslatorMessage::Finished;
+		    known++;
+		    break;
+		case MetaTranslatorMessage::Unfinished:
+		default:
+		    newType = MetaTranslatorMessage::Unfinished;
+		    known++;
+		    break;
+		case MetaTranslatorMessage::Obsolete:
+		    newType = MetaTranslatorMessage::Unfinished;
+		    neww++;
+		}
+	    }
+
+	    if ( newType != m.type() ) {
+		m.setType( newType );
+		tor->insert( m );
+	    }
+	}
+    }
+
+    /*
+      Messages found only in the virgin translator are added to the
+      vernacular translator. Among these are all the context comments.
+    */
+    all = virginTor->messages();
+
+    for ( it = all.begin(); it != all.end(); ++it ) {
+	if ( !tor->contains((*it).context(), (*it).sourceText(),
+			    (*it).comment()) ) {
+	    tor->insert( *it );
+	    if ( !QCString((*it).sourceText()).isEmpty() )
+		neww++;
+	}
+    }
+
+    /*
+      The same-text heuristic handles cases where a message has an
+      obsolete counterpart with a different context or comment.
+    */
+    applySameTextHeuristic( tor, verbose );
+
+    /*
+      The number heuristic handles cases where a message has an
+      obsolete counterpart with mostly numbers differing in the
+      source text.
+    */
+    applyNumberHeuristic( tor, verbose );
+
+    if ( verbose )
+	fprintf( stderr, " %d known, %d new and %d obsoleted messages\n", known,
+		 neww, obsoleted );
+}