当我读取和写入时，是否可以保留xlsx文件中的图表样式（形状样式）？使用下面的代码，样式就会丢失。
require 'vendor/autoload.php';
use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx AS WXlsx;
use PhpOffice\PhpSpreadsheet\Chart\Chart;
use PhpOffice\PhpSpreadsheet\Settings;
use PhpOffice\PhpSpreadsheet\Reader\Xlsx;
echo "Opening file...<br>";
$spreadsheet = new Xlsx();
$spreadsheet->setIncludeCharts(true);
$spreadsheet = $spreadsheet->load("test.xlsx");
echo "Saving file...<br>";
$fileName = "testKeepChart.xlsx";
$writer = new WXlsx($spreadsheet);
$writer->setIncludeCharts(true);
$writer->setPreCalculateFormulas(false);
$writer->save($fileName);
echo "File saved as $fileName.\n";