insertedInto method
Implementation
void insertedInto(ContainerNode insertionPoint) {
  assert(insertionPoint.isConnected || isContainerNode());
  if (insertionPoint.isConnected) {
    _isConnected = true;
  }
}void insertedInto(ContainerNode insertionPoint) {
  assert(insertionPoint.isConnected || isContainerNode());
  if (insertionPoint.isConnected) {
    _isConnected = true;
  }
}