From 43e9403a4cf22cc78e8157db5fbe35afd15cfacb Mon Sep 17 00:00:00 2001
From: Vladimir Golovnev <glassez@yandex.ru>
Date: Fri, 29 Sep 2023 07:33:19 +0300
Subject: [PATCH] Filter out duplicate trackers when replacing

PR #19656.
---
 src/base/bittorrent/torrentimpl.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index 5f59f996f..57ccb5c41 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -657,6 +657,9 @@ void TorrentImpl::removeTrackers(const QStringList &trackers)
 void TorrentImpl::replaceTrackers(QVector<TrackerEntry> trackers)
 {
     trackers.removeIf([](const TrackerEntry &entry) { return entry.url.isEmpty(); });
+    // Filter out duplicate trackers
+    const auto uniqueTrackers = QSet<TrackerEntry>(trackers.cbegin(), trackers.cend());
+    trackers = QVector<TrackerEntry>(uniqueTrackers.cbegin(), uniqueTrackers.cend());
     std::sort(trackers.begin(), trackers.end()
         , [](const TrackerEntry &lhs, const TrackerEntry &rhs) { return lhs.tier < rhs.tier; });