Method _onDataSplice

src/core/core.datasetController.js:1064–1072

(start, count)

  }

  _onDataSplice(start, count) {
    if (count) {
      this._sync(['_removeElements', start, count]);
    }
    const newCount = arguments.length - 2;
    if (newCount) {
      this._sync(['_insertElements', start, newCount]);
    }
  }

  _onDataUnshift() {
    this._sync(['_insertElements', 0, arguments.length]);