[Bug]: 导出画面不全，无论选择哪个画幅，哪个分辨率，画面都不完整

[JackTonyMa]

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Describe the bug

macbookair 13 寸，删除了动态缩放，导出 video，无论哪个画幅和分辨率，屏幕底部的 dock 栏都被裁剪掉一部分

Expected behavior

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