staggerItems property
final
When true, list items fade + slide in with a cascading stagger each time
the overlay opens. Ignored when enabled is false.
The cascade is most visible with non-clipping transitions (scale,
scaleFade, fade or none); the size/sizeFade transitions clip the
list as they reveal it, which can mask the per-item entrance. Pairing it
with a short overlay duration also helps the cascade stand out.
Implementation
final bool staggerItems;