// on OS X widths can be fractions of pixels wide when more than one
// are drawn together, so the sum of all character widths is not necessarily
// (and probably not) the same as the whole string width.
// on OS X widths can be fractions of pixels wide when more than one
// are drawn together, so the sum of all character widths is not necessarily
// (and probably not) the same as the whole string width.