Tracks added twice to audio CD when adding directory

[jimav]

When burning an Audio CD, if a directory containing tracks is added, the user is prompted "search directory for tracks?".
If the user says yes, then the tracks in that directory are added TWICE.

So, for example, if an album-directory is added which contains 5 tracks, the Brasero project will get 10 tracks, two copies of each.

STEPS TO REPRODUCE:

1. Run brasero without arguments
2. Click "Audio project/Create a traditional Audio CD"
3. Click the green "+" in the upper left corner
4. Navigate to a directory containing some .flac track files (do not open the directory; just select the directory name and click Add in the file selector dialog).
5. When prompted whether to search the directory for audio files, click "Search Directory"
(the tracks in the directory will be added twice)

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: brasero 3.2.0-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20
Uname: Linux 3.0.0-16-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Wed Mar 21 11:48:01 2012
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: brasero
UpgradeStatus: No upgrade log present (probably fresh install)