method clone

Source

TextFormat clone() => new TextFormat(font, size, color,
    strokeWidth: strokeWidth, strokeColor: strokeColor, fillGradient: fillGradient,
    weight: weight, bold: bold, italic: italic, underline: underline, align: align,
    topMargin: topMargin, bottomMargin: bottomMargin, leftMargin: leftMargin, rightMargin: rightMargin,
    indent: indent, leading: leading);