- Added a workaround fix for a bug in libtorrent regarding set_priority_up() function

src/bittorrent.cpp

@@ -147,6 +147,8 @@ bool bittorrent::isQueueingEnabled() const {
 void bittorrent::increaseDlTorrentPriority(QString hash) {
   Q_ASSERT(queueingEnabled);
   QTorrentHandle h = getTorrentHandle(hash);
+  // Check due to bug http://code.rasterbar.com/libtorrent/ticket/455
+  if(h.queue_position() > 0)
     h.queue_position_up();
 }