Dirtyfix playlist overlapping controls.

See screenshot.
Could be reproduced by mousescrolling down in the playlist while you are already at the bottom of the playlist (at least for me in Chromium 27.0.1452.0).
![Screenshot325](https://f.cloud.github.com/assets/1410802/319707/3018af68-98d7-11e2-9afe-3435f1917ff0.png)