Rhythmbox library not updated correctly after renaming directories

Binary package hint: rhythmbox

1.) $ lsb_release -rd
Description: Ubuntu 10.04.1 LTS
Release: 10.04

2.) $ apt-cache policy rhythmbox
  Installed: 0.12.8-0ubuntu7
  Candidate: 0.12.8-0ubuntu7
  Version table:
 *** 0.12.8-0ubuntu7 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages
        100 /var/lib/dpkg/status
     0.12.8-0ubuntu3 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid/main Packages

3.) I moved (renamed) subdirectory in ~/Music directory that contained music files. I expected that Rhythmbox would add tracks from new location and remove old tracks from library.

$ rhythmbox &
$ cd ~/Music
$ mv some_directory_with_tracks to_some_other_name

4.) Instead Rhythmbox just added tracks from new location, but left tracks from old location untouched. So my library contained invalid (duplicate) tracks and I needed to restart Rhythmbox to get rid of invalid track entries.