HarmonyOS Tabs的BarMode设置为Scrollable时，初始index设置为当前屏幕范围之外的值，没有滚动到index对应的Bar

请参考demo：

@Entry
@Component
struct TabsExample {
  @State fontColor: string = '#182431'
  @State selectedFontColor: string = '#007DFF'
  @State currentIndex: number = 5
  @State currentIndex2: number = (this.currentIndex ) % 4
  private controller: TabsController = new TabsController()

  @Builder
  tabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontColor(this.currentIndex2 === index ? this.selectedFontColor : this.fontColor)
        .fontSize(16)
        .fontWeight(this.currentIndex2 === index ? 500 : 400)
        .lineHeight(22)
        .margin({ top: 17, bottom: 7 })
      Divider().strokeWidth(2).color('#007DFF').opacity(this.currentIndex2 === index ? 1 : 0)
    }
    .width('50%')
  }

  build() {
    Column() {
      Tabs({
        barPosition: BarPosition.Start, index: this.currentIndex2, controller: this.controller
      }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#00CB87')
        }.tabBar(this.tabBuilder(0, 'green'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#007DFF')
        }.tabBar(this.tabBuilder(1, 'blue'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#FFBF00')
        }.tabBar(this.tabBuilder(2, 'yellow'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#E67C92')
        }.tabBar(this.tabBuilder(3, 'pink'))
      }
      .vertical(false)
      .barMode(BarMode.Scrollable)
      .barWidth(360)
      .barHeight(56)
      .animationDuration(400)
      .onChange((index: number) => {
        this.currentIndex2 = index
      })
      .width(360)
      .height(296)
      .margin({ top: 52 })
      .backgroundColor('#F1F3F5')
    }
    .width('100%')
  }
}
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