Slider.label's docs say that the label is painted using ThemeData.accentTextTheme.body2, which appears to be correct (I didn't check), but unfortunately the thumb itself is painted using the primary color, which is not guaranteed to contrast well with the accentTextTheme.

I assume it's supposed to be using the primaryTextTheme? Or the thumb should use the accent color?

cc @HansMuller @gspencergoog