endCurtain property
The Decoration to display at the end of the scrollable child when there is content beyond/underneath it. (When the end of the scrollable has not been reached.)
Left null, an empty decoration is provided.
Consider a const BoxDecoration(. . .).
The end value in sensitivity correlates to this curtain's
tolerance to the maximum scrollable extent of its child.
Implementation
final Decoration? endCurtain;