fix: 修复在无界框架中,弹出层计算了非iframe区域的高度,导致弹层被遮挡 #11898
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What
Why
当嵌套在无界当中时,弹出层会把非iframe的顶层区域也当成自己的可视区域,计算出来的位置,并不是正确的。超出了iframe的区域,于是不可见。
How
判断当前页面是否是在iframe内部,是的话减去非iframe可视区域的高度。