ttk.go
func Unescape(s string) string {
	if len(s) == 0 {
		return ""
	}

	var ret string
	var rw int
	for i := 0; i < len(s); i += rw {
		v, width := utf8.DecodeRuneInString(s[i:])
		if v == '\x1b' {
			_, skip, err := DecodeColor(s[i:])
			if err == nil {
				rw = skip
				continue

			}
		}
		ret += string(v)
		rw = width
	}

	return ret
}
func Unescape(s string) string {
	if len(s) == 0 {
		return ""
	}

	var ret string
	var rw int
	for i := 0; i < len(s); i += rw {
		v, width := utf8.DecodeRuneInString(s[i:])
		if v == '\x1b' {
			_, skip, err := DecodeColor(s[i:])
			if err == nil {
				rw = skip
				continue

			}
		}
		ret += string(v)
		rw = width
	}

	return ret
}
// Unescape returns the unescaped string.