Convert semantic highlighter to use additional formats

instead of extra selections. This requires a recent
version of Qt 4.7, the beta 2 will not do.

Done-with: Roberto Raggi

src/plugins/texteditor/syntaxhighlighter.h

@@ -46,6 +46,7 @@
 #include <QtCore/qglobal.h>
 #include <QtCore/qobject.h>
 #include <QtGui/qtextobject.h>
+#include <QtGui/QTextLayout>
 
 QT_BEGIN_NAMESPACE
 class QTextDocument;
@@ -74,6 +75,8 @@ public:
     void setDocument(QTextDocument *doc);
     QTextDocument *document() const;
 
+    void setExtraAdditionalFormats(const QTextBlock& block, const QList<QTextLayout::FormatRange> &formats);
+
 public Q_SLOTS:
     void rehighlight();
     void rehighlightBlock(const QTextBlock &block);