new future: highlight searched words in pdf preview

gui/pdfworker.h

@@ -16,7 +16,8 @@ class PdfWorker : public QObject
 {
 	Q_OBJECT
   public:
-	QFuture<PdfPreview> generatePreviews(const QVector<SearchResult> paths, double scalefactor);
+	QFuture<PdfPreview> generatePreviews(const QVector<SearchResult> paths, QVector<QString> wordsToHighlight,
+										 double scalefactor);
 };
 
 #endif // PDFWORKER_H