It seems like the readme for SfSlider implies that there is a possibility of using a secondary track in the slider somehow. In the top most slider of the picture(https://help.syncfusion.com/flutter/slider/overview ) you can see that there's a dark green track for active, a light green for inactive and then there's still a segment of light red track in the end. However I can't seem to find an answer for this anywhere in the Syncfusion manual. Is there such a feature in the slider and if there is, how is it supposed to be accessed?