originGesture property
Live reader: currently-in-flight Origin gesture (drag or scale on an un-displayed item), with its hybrid mode partially resolved up to Origin's level. Stage uses this to decide what to do with new pointers landing in stage-area regions while the Origin is gesturing. Null when no Origin is gesturing.
Exposed as a function (not a value) so callers reading it from a cached StageData reference still see the latest state.
Implementation
final OriginGesture? Function() originGesture;