--- a/QTfrontend/drawmapscene.h	Sun Sep 11 11:09:28 2011 -0400
+++ b/QTfrontend/drawmapscene.h	Sun Sep 11 18:19:05 2011 +0200
@@ -48,6 +48,8 @@
     QBrush m_brush;
     QGraphicsPathItem  * m_currPath;
     Paths paths;
+    Paths oldPaths;
+    QList<QGraphicsItem *> oldItems;
 
     virtual void mouseMoveEvent(QGraphicsSceneMouseEvent * mouseEvent);
     virtual void mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent);