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diff --git a/pylupdate3/merge.cpp b/pylupdate3/merge.cpp
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+/**********************************************************************
+** Copyright (C) 2000 Trolltech AS. All rights reserved.
+**
+** merge.cpp
+**
+** This file is part of Qt Linguist.
+**
+** See the file LICENSE included in the distribution for the usage
+** and distribution terms.
+**
+** The file is provided AS IS with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE.
+**
+**********************************************************************/
+
+#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 text 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::Unfinished;
+ 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:
+ 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 )
+ qWarning( " %d known, %d new and %d obsoleted messages",
+ known, neww, obsoleted );
+}