isUnwrapped property
If isUnwrapped is true, this Foil's gradient will be inactive.
Default is false.
Changing isUnwrapped will cause a smooth intrinsic animation of this
Foil's gradient to an appropriately-Typed, if possible, transparent
Gradient over period of duration (default is 500ms).
- Override the unwrapped-state
Gradientwith unwrappedGradient.

Implementation
final bool isUnwrapped;