Method redo

external/.scrollLibs.js:17570–17576

()

    return this.toString() !== this._getSavedVersion()
  }
  async redo() {
    const undoStack = this._getUndoStack()
    const redoStack = this._getRedoStack()
    if (!redoStack.length) return undefined
    undoStack.push(redoStack.pop())
    return this._reloadFromUndoTop()
  }
  async undo() {
    const undoStack = this._getUndoStack()
    const redoStack = this._getRedoStack()