FreezePane not working in Ods documents

[pszalko]

This is:

- [X] a bug report
- [ ] 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?

This code should freeze row 1 in Ods document:

$sheet->freezePane('A2');

What is the current behavior?

First row is not frozen.

What are the steps to reproduce?

1. Select current sheet.
2. Freeze row as in code sample above.

Please provide a Minimal, Complete, and Verifiable example of code that exhibits the issue without relying on an external Excel file or a web server:

<?php

require __DIR__ . '/vendor/autoload.php';

// Create new Spreadsheet object
$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();

// add code that show the issue here...
$sheet = $spreadsheet->getActiveSheet();
$sheet->setCellValue('A1', 'hello world!');
$sheet->freezePane('A2');

$filename = tempnam('/tmp', 'export_');
$writer = new \PhpOffice\PhpSpreadsheet\Writer\Ods($spreadsheet);
$writer->save($filename);

Which versions of PhpSpreadsheet and PHP are affected?

I'm using: 1.17, didn't test earlier versions.

[MarkBaker]

At the moment, FreezePane is only supported by the Xls and Xlsx Readers and Writers; Ods has rather a awkward data structure for frozen panes, I'll need to investigate further just how it's defined to see how practical it is to implement.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
If this is still an issue for you, please try to help by debugging it further and sharing your results.
Thank you for your contributions.