copyMask method
Implementation
void copyMask(ActorMask from, ActorArtboard resetArtboard) {
  copyLayerEffect(from, resetArtboard);
  _sourceIdx = from._sourceIdx;
  _maskType = from._maskType;
}void copyMask(ActorMask from, ActorArtboard resetArtboard) {
  copyLayerEffect(from, resetArtboard);
  _sourceIdx = from._sourceIdx;
  _maskType = from._maskType;
}