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This maybe is a robust way to get Monaspace fonts working. Previously, we used leading as part of the calculation in cell height. I don't remember why. It appears most popular monospace fonts (Fira Code, Berkeley Mono, JetBrains Mono, Monaco are the few I tested) have a value of 0 for leading, so this has no effect. But some fonts like Monaspace have a non-zero (positive) value, resulting in overly large cell heights. The issue is that we simply add leading to the height, without modifying ascent. Normally this is what you want (normal typesetting) but for terminals, we're trying to set text centered vertically in equally spaced grid cells. For this, we want to split the leading between the top and bottom.