为了导出侧边栏，主体区域现在暂时的使用垂直拉伸。
In order to export the sidebar, the main content area is temporarily stretched vertically.
如果在一面是垂直拉伸的，在另一面水平方向，如果你继续散焦，会变成对称的圆环。
Not round and on one side it will be elongated vertical and the other side horizontal then as you go more defocus it will snap to a perfect symmetrical circle.
图 3 中绿色填充区只会垂直拉伸。 也就是说，当文本域比图像高的时候，这些区域就会变高。
The green-tinted regions in Figure 3 will only stretch in the vertical; that is, they'll grow when the text field is taller than the image.
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