x/mosaic rendering width does not bake in assumptions about character aspect ratio

[minkezhang]

Description

Given the example in x/mosaic, if I were instead to remove the lines enforcing a height and width, the documentation states that the default here should be the base image height and width. Given the input image of a square --

m := mosaic.New() // .Width(80).Height(40)

I would expect that the terminal render would still be a square. However, we see the actual output

The fix seems to be manually changing the render width to twice the image size, as reported by img.Bounds().Max.X, i.e.

mosaic.New().Width(img.Bounds().Max.X * 2).Render(...)

Is this behavior expected?

Version

No response

Environment

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