new future: highlight searched words in pdf preview

gui/mainwindow.h

@@ -9,6 +9,7 @@
 #include <QFutureWatcher>
 #include <QSqlDatabase>
 #include "pdfworker.h"
+#include "../shared/qssquery.h"
 namespace Ui
 {
 class MainWindow;
@@ -41,6 +42,7 @@ class MainWindow : public QMainWindow
 	unsigned int processedPdfPreviews;
 	void handleSearchResults(const QVector<SearchResult> &results);
 	void handleSearchError(QString error);
+	QSSQuery currentQuery;
   private slots:
 	void lineEditReturnPressed();
 	void treeSearchItemActivated(QTreeWidgetItem *item, int i);