AllenOYang

使用的官方的例子的时候同样复现 http://www.treejs.cn/v3/demo/cn/super/left_menuForOutLook.html 修改别人的bug时候发现这个问题，如有时间希望可以更新一下这个问题。  

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[improvement]: UI style display is not correct

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### 1~3 main use cases of the proposed improvement UI style display is not correct ### Ideas for solution ### what types of users can benefit from using your proposed...