Breaking: #101149 - Mark PageTsBackendLayoutDataProvider as final 

See forge#101149

Description 

The class \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider is marked as final.

Impact 

It is no longer possible to extend the class \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider .

Affected installations 

Classes extending \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider .

Migration 

Instead of extending the data provider, it is recommended to register a custom DataProvider for backend layouts, which can already be used since TYPO3 v7.