Comment 3 for bug 1380467

Actually it would be better to also highlight playlists in which the selected track is included. So maybe that way:

1) some signal on selection change in the library-Table-View which gives the selected trackId
2) a new member highlightTrackId in TreeItemModel which stores the id of the track to be highlighted
3) a condition in TreeItemModel::data for role = QBackgroundRole to change the background (or something else) for the TreeItems whose child-models contain highlightTrackId
4) a slot in TreeItemModel to set highlightTrackId
5) some way to connect the signal of selection change (1) to the slot(4)