Temporarily revert PR #2885 (filename column in peers view).

There's a bug that causes frequent crashes.
Issue #4597.

src/base/bittorrent/peerinfo.cpp

@@ -408,8 +408,3 @@ QString PeerInfo::flagsDescription() const
 {
     return m_flagsDescription;
 }
-
-int PeerInfo::downloadingPieceIndex() const
-{
-    return m_nativeInfo.downloading_piece_index;
-}

src/base/bittorrent/peerinfo.h

@@ -100,7 +100,6 @@ namespace BitTorrent
 #ifndef DISABLE_COUNTRIES_RESOLUTION
         QString country() const;
 #endif
-        int downloadingPieceIndex() const;
 
     private:
         void calcRelevance(const TorrentHandle *torrent);

src/base/bittorrent/torrentinfo.cpp

@@ -211,20 +211,6 @@ QByteArray TorrentInfo::metadata() const
     return QByteArray(m_nativeInfo->metadata().get(), m_nativeInfo->metadata_size());
 }
 
-QStringList TorrentInfo::filesForPiece(int pieceIndex) const
-{
-    if (pieceIndex < 0)
-        return QStringList();
-
-    std::vector<libtorrent::file_slice> files(
-        nativeInfo()->map_block(pieceIndex, 0, nativeInfo()->piece_length()));
-    QStringList res;
-    for (const libtorrent::file_slice& s: files) {
-        res.append(filePath(s.file_index));
-    }
-    return res;
-}
-
 void TorrentInfo::renameFile(uint index, const QString &newPath)
 {
     if (!isValid()) return;

src/base/bittorrent/torrentinfo.h

@@ -75,7 +75,6 @@ namespace BitTorrent
         QList<TrackerEntry> trackers() const;
         QList<QUrl> urlSeeds() const;
         QByteArray metadata() const;
-        QStringList filesForPiece(int pieceIndex) const;
 
         void renameFile(uint index, const QString &newPath);
         boost::intrusive_ptr<libtorrent::torrent_info> nativeInfo() const;