Qt4: Media Librarys "Add to playlist" selection adds file to playlist multiple times

As noticed in: http://forum.videolan.org/viewtopic.php?f=14&t=99028&p=332585

With Qt4 interface, if one uses Media Librarys "Add to playlist" selection, the selected item is added to playlist multiple times. Tested under Win32 with VLC 2.0.0 and VLC 2.1.0-git-20120318-0008.

Sample images: http://i.imgur.com/gSSBZ.png http://i.imgur.com/8Tafw.png

Log says

main debug: Creating an input for '08-Violet Hill (Album Version).mp3'
main debug: rebuilding array of current - root Playlist
main debug: rebuild done - 22 items, index -1
main debug: no fetch required for Violet Hill (Album Version) (art currently (null))
main debug: Creating an input for '08-Violet Hill (Album Version).mp3'
main debug: no fetch required for Violet Hill (Album Version) (art currently (null))
main debug: Creating an input for '08-Violet Hill (Album Version).mp3'
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