HarmonyOS 下拉刷新组件，顶部padding会导致下拉刷新的UI暴露出来

build() {  
    Column(){  
      Flex({ direction: FlexDirection.Column }){  
        UserInfoHeader()  
        Refresh({ refreshing: $$this.isRefreshing, builder: this.customRefreshComponent() }) {  
          List({ space: 12, initialIndex: 0 }){  
            ForEach(this.cards,(item:CardData)=>{  
              ListItem(){  
                       ...//自定义Card  
                  }  
            })  
          }  
          .padding({left:12,right:12,top:12})  
          .scrollBar(BarState.Off)  
        }  
        .onStateChange((refreshStatus: RefreshStatus) => {  
          console.info('Refresh onStatueChange state is ' + refreshStatus)  
        })  
        .onRefreshing(() => {  
          this.refresh()  
          setTimeout(() => {  
            this.isRefreshing = false  
          }, 5000)  
          console.log('onRefreshing test')  
        })  
        .backgroundColor(0x89CFF0)  
        .backgroundColor('#F0F1F5')  
      }  
    }  
  }
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