Breaking: #52877 - Remove ExtJS Viewport

See Issue #52877

Description

The ExtJS component TYPO3.Viewport has been removed from the TYPO3 Core, Ext.layout and Ext.Viewport are no longer used in the backend viewport.

Impact

• Calling the removed ExtJS components TYPO3.Viewport or TYPO3.backendContentIframePanel will result in an error
• The ability to stack content with cards with TYPO3.Viewport.ContentCards is no longer supported

Affected Installations

Any TYPO3 installations using custom extensions based on ExtJS which rely on the above mentioned components.

Migration

There is no migration available.