unselectedToggleIsColored property
Defines is unselected Switch, Checkbox and Radio also use their themed color.
Flutter SDK use neutral grey for switches, checkboxes and radio buttons
when they are not selected. To some this may even look like it is
disabled. By setting unselectedSwitchesIsColored to true, they
use their themed color also in the unselected state. The Checkbox and
Radio use their theme color in the outline. The Switch has just a hint
of its themed color in it inactive track.
Defaults to false, set it to for slightly different style.
Implementation
final bool unselectedToggleIsColored;