Preserve dynamic tables when opening and saving Excel files, instead of converting them to plain text.
This is: ``` - [ ] a bug report - [V] a feature request - [ ] **not** a usage question (ask them on https://stackoverflow.com/questions/tagged/phpspreadsheet or https://gitter.im/PHPOffice/PhpSpreadsheet) ``` ### What is the expected behavior? Open the excel file (.xlsx) with dynamic tables and save the same file with dynamic tables ### What is the current behavior? The spreadsheet opens the excel file and saves the file without dynamic tables. Only plain text. ### What are the steps to reproduce? Use reader fuction to open the file Force to readonly Define a worksheet Use writer function to save the file Please provide a [Minimal, Complete, and Verifiable example](https://stackoverflow.com/help/mcve) of code that exhibits the issue without relying on an external Excel file or a web server: ```php <?php require __DIR__ . '/vendor/autoload.php'; // Create new Spreadsheet object $spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet(); use PhpOffice