Use case

It is possible to set the conditions under which the value indicator on a Slider will be shown by setting showValueIndicator in SliderTheme. However, Slider itself is lacking the showValueIndicator property.

When a user wants to override the showValueIndicator for a specific Slider, they have to wrap it into SliderTheme to achieve the desired behavior.

SliderTheme(
  data: SliderThemeData(
    showValueIndicator: ShowValueIndicator.alwaysVisible,
  ),
  child: Slider(
    value: 0.5,
    label: '0.5',
    onChanged: (double value) {},
  ),
),

Proposal

Add Slider.showValueIndicator property to allow user to set the conditions under which the value indicator will be shown for a specific Slider.

Slider(
  value: 0.5,
  label: '0.5',
  onChanged: (double value) {},
  mouseCursor: SystemMouseCursors.click,
  showValueIndicator: ShowValueIndicator.alwaysVisible,
)