1 Select a track in docked Now Playing (track is highlighted blue as expected)
2 Click a Track List track (NP highlighted goes to grey as expected
3 Drag the track from Track List to an UNselected track in NP - as expected, NP selected track highlight remains grey:

4 Drag the track from Track List to the SELECTED track in NP
Observed: highlight goes blue, falsely indicating focus and hiding the drop indicator meaning the user cannot tell if the drop is above or below the track:

Expected: highlight stays grey, showing the drop indicator:

The same issue affects drags from Now Playing to a playlist's Track List.
Tracked at http://www.ventismedia.com/mantis/view.php?id=5866