Option to have minimap behind text?

By default, the minimap takes up a fair bit of space. In a typical file, most lines will not take up the full width, and the minimap won't fill up the full window height. So the minimap could be moved over the text area producing only a small amount of overlap between actual content. In this situation, it would be interesting to see how things work if the minimap is behind the text, rather than in front. Then, the text would still be readable, and the minimap would still be useable, and no screen real estate would be wasted. I don't know if this is would work well in practice, but might be worth investigating.