Results 8 issues of bai

### Platforms Android, iOS ### Description 我想实现如下图圆角除的效果,发现headerSliverBuilder里的内容会遮挡body里面的内容,如视频 https://user-images.githubusercontent.com/23705172/228119980-70eeb058-53f9-4ca9-bce1-857b20d43790.mp4 ### My code `DefaultTabController( length: 2, child: Column( children: [ Expanded( child: ExtendedNestedScrollView( headerSliverBuilder: (context, _) { return [ SliverToBoxAdapter( child: SizedBox(...

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