Fix drag-and-drop of playlist items onto a playlist icon.
This allows you to drag music tracks onto a different playlist, by dropping the selected tracks onto the name of a different playlist. There still seem to be other bugs (Dragging items onto play queue doesn't enable play queue automatically; some playlists aren't properly saved for some reason). But those will have to be fixed in other commits. FIXED-IN:19.04.3 BUG:392705
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