HarmonyOS LazyForEach遇到下拉刷新，全部数据都替换，应该怎么处理

关于这个问题，当数据项在数组中的位置更改时，其键值不得更改，当数组中的数据项被新项替换时，被替换项的键值和新项的键值必须不同，所以想更新已经加载完的数据时要重新生成key且key值不能与旧的key值相同。

参考demo：

class BasicDataSource implements IDataSource {
  private listeners: DataChangeListener[] = [];
  private originDataArray: string[] = [];

  public totalCount(): number {
    return 0;
  }

  public getData(index: number): string {
    return this.originDataArray[index];
  }

  registerDataChangeListener(listener: DataChangeListener): void {
    if (this.listeners.indexOf(listener) < 0) {
      console.info('add listener');
      this.listeners.push(listener);
    }
  }

  unregisterDataChangeListener(listener: DataChangeListener): void {
    const pos = this.listeners.indexOf(listener);
    if (pos >= 0) {
      console.info('remove listener');
      this.listeners.splice(pos, 1);
    }
  }

  notifyDataReload(): void {
    this.listeners.forEach(listener => {
      listener.onDataReloaded();
    })
  }

  notifyDataAdd(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataAdd(index);
    })
  }

  notifyDataChange(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataChange(index);
    })
  }

  notifyDataDelete(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataDelete(index);
    })
  }

  notifyDataMove(from: number, to: number): void {
    this.listeners.forEach(listener => {
      listener.onDataMove(from, to);
    })
  }
}

class MyDataSource extends BasicDataSource {
  private dataArray: string[] = [];

  public totalCount(): number {
    return this.dataArray.length;
  }

  public getData(index: number): string {
    return this.dataArray[index];
  }

  public addData(index: number, data: string): void {
    this.dataArray.splice(index, 0, data);
    this.notifyDataAdd(index);
  }

  public pushData(data: string): void {
    this.dataArray.push(data);
    this.notifyDataAdd(this.dataArray.length - 1);
  }

  public deleteData(index: number): void {
    this.dataArray.splice(index, 1);
    this.notifyDataDelete(index);
  }

  public changeData(index: number): void {
    this.notifyDataChange(index);
  }

  public reloadData(): void {
    this.notifyDataReload();
  }

  public modifyAllData(): void {
    // newData为请求回来的数据
    // 如果是网络请求的话需要确定拿到数据并成功将数据更新后在调用reloadData()方法
    let newData: Array<string> = [];
    for (let i = 0; i <= 20; i++) {
      // 原始数据
      newData.push(`新的数据 ${i}`)
    }
    // this.clear()置空
    this.dataArray = [];
    this.dataArray.push(...newData)
  }
}

@Entry
@Component
struct MyComponent {
  @State isRefreshing: boolean = false
  @State counter: number = 0
  private moved: number[] = [];
  private data: MyDataSource = new MyDataSource();

  aboutToAppear() {
    for (let i = 0; i <= 20; i++) {
      // 原始数据
      this.data.pushData(`Hello ${i}`)
    }
  }

  build() {
    Column() {
      Refresh({ refreshing: $$this.isRefreshing, offset: 120, friction: 100 }) {
        Column(){
          List({ space: 3 }) {
            LazyForEach(this.data, (item: string, index: number) => {
              ListItem() {
                Row() {
                  Text(item).fontSize(50)
                    .onAppear(() => {
                      console.info("appear:" + item)
                    })
                }.margin({ left: 10, right: 10 })
              }
            }, (item: string) => item)
          }.cachedCount(5)
        }
      }
      .onRefreshing(() => {
        setTimeout(() => {
          this.data.modifyAllData();
          this.data.reloadData();
          this.isRefreshing = false
        }, 1000)
        console.log('onRefreshing test')
      })
    }
  }
}
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