Set default file priorities when not specified (#15190)

src/base/bittorrent/session.cpp

@@ -89,6 +89,7 @@
 #include "common.h"
 #include "customstorage.h"
 #include "dbresumedatastorage.h"
+#include "downloadpriority.h"
 #include "filesearcher.h"
 #include "filterparserthread.h"
 #include "loadtorrentparams.h"
@@ -2146,12 +2147,21 @@ bool Session::addTorrent_impl(const std::variant<MagnetUri, TorrentInfo> &source
         }
 
         Q_ASSERT(p.file_priorities.empty());
-        std::transform(addTorrentParams.filePriorities.cbegin(), addTorrentParams.filePriorities.cend()
-                       , std::back_inserter(p.file_priorities), [](const DownloadPriority priority)
+        if (addTorrentParams.filePriorities.empty())
         {
-            return static_cast<lt::download_priority_t>(
+            // Use qBittorrent default priority rather than libtorrent's (4)
+            p.file_priorities = std::vector(metadata.filesCount(), static_cast<lt::download_priority_t>(
+                    static_cast<lt::download_priority_t::underlying_type>(DownloadPriority::Normal)));
+        }
+        else
+        {
+            std::transform(addTorrentParams.filePriorities.cbegin(), addTorrentParams.filePriorities.cend()
+                           , std::back_inserter(p.file_priorities), [](const DownloadPriority priority)
+            {
+                return static_cast<lt::download_priority_t>(
                         static_cast<lt::download_priority_t::underlying_type>(priority));
-        });
+            });
+        }
 
         p.ti = metadata.nativeInfo();
     }

src/base/bittorrent/torrentimpl.cpp

@@ -1512,6 +1512,10 @@ void TorrentImpl::endReceivedMetadataHandling(const QString &savePath, const QSt
         p.renamed_files[lt::file_index_t {i}] = fileNames[i].toStdString();
     p.save_path = Utils::Fs::toNativePath(savePath).toStdString();
 
+    // Use qBittorrent default priority rather than libtorrent's (4)
+    p.file_priorities = std::vector(fileNames.size(), static_cast<lt::download_priority_t>(
+            static_cast<lt::download_priority_t::underlying_type>(DownloadPriority::Normal)));
+
     reload();
 
     // If first/last piece priority was specified when adding this torrent,