
Expose the RangeSlider's TextDirection in the RangeSliderThumbShape's abstract paint() method, and ensure that start and end thumb are non-null when being passed to the thumb and value indicator shape paint methods.
Expose the RangeSlider's TextDirection in the RangeSliderThumbShape's abstract paint() method, and ensure that start and end thumb are non-null when being passed to the thumb and value indicator shape paint methods.