Unicode makes this wayyyyyy trickier. There’s at least one width-12 composed character sequence for instance. Fonts may render things at fractions of a cell w

Unicode makes this wayyyyyy trickier. There’s at least one width-12 composed character sequence for instance. Fonts may render things at fractions of a cell width unless special work is done to make them fall on integer boundaries. And that’s before you even get into how the number of bytes that will generate a particular final cell rendering could be practically anything. Ah, the good old days of just 1x or 2x text. :)