childAnchor property
The childAnchor and portalAnchor are the alignments of the reactions list around prefix and suffix widgets.
FlutterFeedReaction(
childAnchor: Alignment.topRight,
portalAnchor: Alignment.bottomLeft,
)
What this code means is, this will align the bottom-left of the reactions list widget with the top-right of the prefix and suffix widget.
When not specified childAnchor defaults to Alignment.topLeft.
Implementation
final Alignment childAnchor;