HarmonyOS鸿蒙Next中List组件添加数据时如何保持列表不自动滚动

看下如下demo能否实现

@ObservedV2
class ArrayHolder {
  @Trace arr: Array<number> = [];

  // constructor，用于初始化数组个数
  constructor(count: number) {
    for (let i = 0; i < count; i++) {
      this.arr.push(i);
    }
  }
}

@Entry
@ComponentV2
struct RepeatScrollPage {
  @Local arrayHolder: ArrayHolder = new ArrayHolder(100);
  @Local totalCount: number = this.arrayHolder.arr.length;
  scroller: Scroller = new Scroller();

  // fix
  private start: number = 1;
  private end: number = 1;
  // end

  build() {
    Column({ space: 5 }) {
      List({ space: 20, initialIndex: 19, scroller: this.scroller }) {
        Repeat(this.arrayHolder.arr)
          .virtualScroll({ totalCount: this.totalCount })
          .templateId((item, index) => {
            return 'number';
          })
          .template('number', (r) => {
            ListItem() {
              Text(r.index! + ":" + r.item + "Reuse");
            }
          })
          .each((r) => {
            ListItem() {
              Text(r.index! + ":" + r.item + "eachMessage");
            }
          })
      }
      // fix
      .onScrollIndex((start, end) => {
        this.start = start;
        this.end = end;
      })
      // end
      .height('30%')

      Button(`insert totalCount ${this.totalCount}`)
        .height(60)
        .onClick(() => {
          // 插入元素，元素位置为屏幕显示的前一个元素
          this.arrayHolder.arr.splice(18, 0, this.totalCount);
          // fix
          let rect = this.scroller.getItemRect(this.start); // 获取子组件的大小位置
          this.scroller.scrollToIndex(this.start + 1); // 滑动到指定index
          this.scroller.scrollBy(0, -rect.y); // 滑动指定距离
          // end
          this.totalCount = this.arrayHolder.arr.length;
        })
    }
    .width('100%')
    .margin({ top: 5 })
  }
}

通过 onScrollIndex 记录当前索引位置实现的，可以参考如下文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-container-scroll-V5#scrolltoindex