liveRegion property

bool liveRegion

If non-null, sets the SemanticsNode.isLiveRegion semantic to the given value.

Implementation 

bool get liveRegion => _liveRegion;
void liveRegion= (bool value)

Implementation 

set liveRegion(bool value) {
  if (_liveRegion == value)
    return;
  _liveRegion = value;
  markNeedsSemanticsUpdate();
}