Swimlane: horizontal scrolling should be possible (when moving playhead and annotations)
If you zoomed in the swimlane and you want to move the playhead out of the zoomed area, the swimlane does not scroll horizontally. You instead have to use the control bar. Helena (Cologne) reported that this is really unhandy during a more detailed/refined annotation process. It should also scorll if you want to move an annotation out of the visible (zoomed in) range.