Method _recordChange

external/.scrollLibs.js:17613–17616

(newVersion)

    this.setSubparticles(this._getTopUndoVersion())
  }
  _recordChange(newVersion) {
    this._clearRedoStack()
    this._getUndoStack().push(newVersion) // todo: use diffs?
  }
  static fromCsv(str) {
    return this.fromDelimited(str, ",", '"')
  }