continuationKey property

GlobalKey<State<StatefulWidget>>? continuationKey

A second boundary, captured whole and drawn directly below the kept part of boundaryKey, continuationX in from its left edge.

This is how a scroll viewport exports its whole content rather than its visible window: clipHeight cuts the boundary at the viewport's top and this boundary, round the scrolled content, carries every row from there.

Implementation

final GlobalKey? continuationKey;