model/src/main/java/jetbrains/jetpad/model/transform/Transformers.java [1202:1213]:
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      @Override
      public Transformation<ObservableList<SourceT>, ObservableList<TargetT>> transform(ObservableList<SourceT> from) {
        return transform(from, new ObservableArrayList<TargetT>());
      }

      @Override
      public Transformation<ObservableList<SourceT>, ObservableList<TargetT>> transform(
          ObservableList<SourceT> from, final ObservableList<TargetT> to) {
        CollectionListener<SourceT> fromListener = new CollectionAdapter<SourceT>() {
          @Override
          public void onItemAdded(CollectionItemEvent<? extends SourceT> event) {
            int pos = event.getIndex();
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model/src/main/java/jetbrains/jetpad/model/transform/Transformers.java [1273:1284]:
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      @Override
      public Transformation<ObservableList<SourceT>, ObservableList<TargetT>> transform(ObservableList<SourceT> from) {
        return transform(from, new ObservableArrayList<TargetT>());
      }

      @Override
      public Transformation<ObservableList<SourceT>, ObservableList<TargetT>> transform(
          ObservableList<SourceT> from, final ObservableList<TargetT> to) {
        CollectionListener<SourceT> fromListener = new CollectionAdapter<SourceT>() {
          @Override
          public void onItemAdded(CollectionItemEvent<? extends SourceT> event) {
            int pos = event.getIndex();
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