relativeAnimateTo method
Implementation
Future<void> relativeAnimateTo(double offset,
{required Duration duration, required Curve curve}) async {
assert(positions.isNotEmpty,
'ScrollController not attached to any scroll views.');
await Future.wait<void>(<Future<void>>[
for (final ScrollPosition position in positions)
(position as SheetPosition)
.relativeAnimateTo(offset, duration: duration, curve: curve),
]);
}