model/src/main/java/jetbrains/jetpad/model/transform/Transformers.java [1461:1476]:
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            to.clear();
            if (from.get() != null) {
              to.add(from.get());
            }
          }
        };
        sync.run();

        return new SimpleTransformation<>(from, to, from.addHandler(new EventHandler<PropertyChangeEvent<ItemT>>() {
          @Override
          public void onEvent(PropertyChangeEvent<ItemT> event) {
            sync.run();
          }
        }));
      }
    };
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model/src/main/java/jetbrains/jetpad/model/transform/Transformers.java [1498:1513]:
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            to.clear();
            if (from.get() != null) {
              to.add(from.get());
            }
          }
        };
        sync.run();

        return new SimpleTransformation<>(from, to, from.addHandler(new EventHandler<PropertyChangeEvent<ItemT>>() {
          @Override
          public void onEvent(PropertyChangeEvent<ItemT> event) {
            sync.run();
          }
        }));
      }
    };
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