made the listWidget redraw at every timeupdate event (added a small optimization though,
to make sure that the widget isn't redrawn all the time).
<div class='Ldt-sparklineWidget' style='width: {{width}}px; height: {{height}}px'>
<div class='Ldt-sparkLinePositionMarker' style='width: 0px; height: {{height}}px'></div>
<div class='Ldt-sparkLineClickOverlay' style='width: {{width}}px; height: {{height}}px'></div>
<div class='Ldt-sparkLine' style='width: {{width}}px; height: {{height}}px'>Loading</div>
</div>