Function insert

packages/2d/src/lib/utils/diff.ts:106–118

(item: TransformDiffItem<T>)

  cloner: (original: T) => T,
): ApplyTransformResult<T> {
  function insert(item: TransformDiffItem<T>) {
    let idIndex = -1;
    const index = item.before
      ? current.findIndex(({id}) => {
          if (id === item.before?.id) {
            idIndex++;
            if (idIndex === item.beforeIdIndex) return true;
          }
          return false;
        })
      : 0;
    current.splice(index + 1, 0, item.current);
  }

  const result: ApplyTransformResult<T> = {
    inserted: diff.inserted.map(item => ({