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).
{{! template for the slider widget - it's composed of two divs we one overlayed on top
of the other }}
<div class='Ldt-sliderBackground'></div>
<div class='Ldt-sliderForeground'></div>
<div class='Ldt-sliderPositionMarker'></div>