draggable RangeSlider

[Bvngee]

Hi,

I'd like to be able to click in the middle of my RangeSlider and drag the whole selection horizontally, instead of just auto-selecting the closest thumb.

I selected feature request as I think this is a worthwhile feature (See Ant Design's draggableTrack for reference: https://github.com/ant-design/ant-design/blob/master/components/slider/demo/draggableTrack.tsx). That being said, if there's any way to implement this using just what's given, I'd be perfectly satisfied!

Thanks in advance for any help!