Use case

I want to customise a RangeSlider Thumb by adding the current value in the thumb.
It is possible with the SliderThumbShape class, since the paint() method is also passing the current value as the value parameter.
Please note that the RangeSliderValueIndicatorShape also include this value parameter.
So it seems like an incoherency in the API.

Proposal

Add the value (or values) parameter to the paint() method of RangeSliderThumbShape.
Please see #39882 which already added this parameter but sadly the issue was automatically closed...