Tracker is errored only if all local endpoints fail

Closes #11691

src/base/bittorrent/torrenthandle.cpp

@@ -1693,7 +1693,17 @@ void TorrentHandle::handleTrackerErrorAlert(const lt::tracker_error_alert *p)
 
     m_trackerInfos[trackerUrl].lastMessage = message;
 
-    m_session->handleTorrentTrackerError(this, trackerUrl);
+    // Starting with libtorrent 1.2.x each tracker has multiple local endpoints from which
+    // an announce is attempted. Some endpoints might succeed while others might fail.
+    // Emit the signal only if all endpoints have failed. TrackerEntry::isWorking() returns
+    // true if at least one endpoint works.
+    const QVector<TrackerEntry> trackerList = trackers();
+    const auto iter = std::find_if(trackerList.cbegin(), trackerList.cend(), [&trackerUrl](const TrackerEntry &entry)
+    {
+        return (entry.url() == trackerUrl);
+    });
+    if ((iter != trackerList.cend()) && !iter->isWorking())
+        m_session->handleTorrentTrackerError(this, trackerUrl);
 }
 
 void TorrentHandle::handleTorrentCheckedAlert(const lt::torrent_checked_alert *p)

src/base/bittorrent/trackerentry.cpp

@@ -54,9 +54,13 @@ QString TrackerEntry::url() const
 
 bool TrackerEntry::isWorking() const
 {
+    // lt::announce_entry::is_working() returns
+    // true when the tracker hasn't been tried yet.
 #if (LIBTORRENT_VERSION_NUM < 10200)
-    return nativeEntry().is_working();
+    return nativeEntry().verified && nativeEntry().is_working();
 #else
+    if (!nativeEntry().verified)
+        return false;
     const auto &endpoints = nativeEntry().endpoints;
     return std::any_of(endpoints.begin(), endpoints.end()
                        , [](const lt::announce_endpoint &endpoint)
@@ -73,9 +77,7 @@ int TrackerEntry::tier() const
 
 TrackerEntry::Status TrackerEntry::status() const
 {
-    // lt::announce_entry::is_working() returns
-    // true when the tracker hasn't been tried yet.
-    if (nativeEntry().verified && isWorking())
+    if (isWorking())
         return Working;
 
 #if (LIBTORRENT_VERSION_NUM < 10200)