Merge pull request #13591 from ronso0/laylist-drag-update-label-fix

(fix) Playlists: update sidebar when dragging tracks into the playlist table

Author: daschuer

src/library/dao/playlistdao.cpp

@@ -796,6 +796,7 @@ int PlaylistDAO::insertTracksIntoPlaylist(const QList<TrackId>& trackIds,
         emit trackAdded(playlistId, trackId, insertPositon++);
     }
     emit tracksAdded(QSet<int>{playlistId});
+    emit playlistContentChanged(QSet<int>{playlistId});
     return numTracksAdded;
 }