HarmonyOS 横竖屏翻转卡顿

可参考以下demo：

import { window } from '@kit.ArkUI';
import { BusinessError } from '@kit.BasicServicesKit';

@Entry
@Component
struct Index {
  orientation: window.Orientation = window.Orientation.UNSPECIFIED;
  @State message: string = 'Hello World';

  build() {
    Column() {
      Button("测试").onClick(()=>{
        this.buildOnc()
      })
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
    }
    .height('100%')
    .width('100%')
  }

  buildOnc(){
    let context = getContext(this);
    this.orientation =this.orientation==  window.Orientation.PORTRAIT?window.Orientation.LANDSCAPE:window.Orientation.PORTRAIT;
    let windowClass: window.Window | undefined = undefined;
    try {
      window.getLastWindow(context, (err: BusinessError, data) => {
        const errCode: number = err.code;
        if (errCode) {
          console.error(`Failed to obtain the top window. Cause code: ${err.code}, message: ${err.message}`);
          return;
        }
        windowClass = data;
        console.info('Succeeded in obtaining the top window. Data: ' + JSON.stringify(data));
        try {
          windowClass.setPreferredOrientation(this.orientation, (err: BusinessError) => {
            const errCode: number = err.code;
            if (errCode) {
              console.error(`Failed to set window orientation. Cause code: ${err.code}, message: ${err.message}`);
              return;
            }
            console.info('Succeeded in setting window orientation.');
          });
        } catch (exception) {
          console.error(`Failed to set window orientation. Cause code: ${exception.code}, message: ${exception.message}`);
        }
      });
    } catch (exception) {
      console.error(`Failed to obtain the top window. Cause code: ${exception.code}, message: ${exception.message}`);
    }
  }
}

在横竖屏切换的时候会有个黑色背景，这个算规格。