Properly add torrent with new tags

First, an attempt is made to add new tags to the Session.
Closes #15105.

src/base/bittorrent/session.cpp

@@ -838,17 +838,13 @@ bool Session::hasTag(const QString &tag) const
 
 bool Session::addTag(const QString &tag)
 {
-    if (!isValidTag(tag))
+    if (!isValidTag(tag) || hasTag(tag))
         return false;
 
-    if (!hasTag(tag))
-    {
     m_tags.insert(tag);
     m_storedTags = m_tags.values();
     emit tagAdded(tag);
     return true;
-    }
-    return false;
 }
 
 bool Session::removeTag(const QString &tag)
@@ -2056,7 +2052,6 @@ LoadTorrentParams Session::initLoadTorrentParams(const AddTorrentParams &addTorr
     LoadTorrentParams loadTorrentParams;
 
     loadTorrentParams.name = addTorrentParams.name;
-    loadTorrentParams.tags = addTorrentParams.tags;
     loadTorrentParams.firstLastPiecePriority = addTorrentParams.firstLastPiecePriority;
     loadTorrentParams.hasSeedStatus = addTorrentParams.skipChecking; // do not react on 'torrent_finished_alert' when skipping
     loadTorrentParams.contentLayout = addTorrentParams.contentLayout.value_or(torrentContentLayout());
@@ -2081,6 +2076,12 @@ LoadTorrentParams Session::initLoadTorrentParams(const AddTorrentParams &addTorr
     else
         loadTorrentParams.category = addTorrentParams.category;
 
+    for (const QString &tag : addTorrentParams.tags)
+    {
+        if (hasTag(tag) || addTag(tag))
+            loadTorrentParams.tags.insert(tag);
+    }
+
     return loadTorrentParams;
 }