Multi-tracker: announce to all trackers to avoid stalling issues

with libtorrent.

src/qtlibtorrent/qbtsession.cpp

@@ -392,8 +392,9 @@ void QBtSession::configureSession() {
   //sessionSettings.announce_to_all_trackers = true;
   sessionSettings.auto_scrape_interval = 1200; // 20 minutes
 #if LIBTORRENT_VERSION_MINOR > 14
-  // Comply with the multi-tracker specification
+  // XXX: Does not comply with the multi-tracker specification
-  sessionSettings.announce_to_all_trackers = false;
+  // but avoids stalling issues with libtorrent
+  sessionSettings.announce_to_all_trackers = true;
   sessionSettings.announce_to_all_tiers = false;
   sessionSettings.auto_scrape_min_interval = 900; // 15 minutes
 #endif