Breaking: #52877 - Remove ExtJS Viewport¶
The ExtJS component
TYPO3.Viewport has been removed from the TYPO3 Core,
Ext.Viewport are no longer
used in the backend viewport.
Calling the removed ExtJS components
TYPO3.backendContentIframePanelwill result in an error
The ability to stack content with cards with
TYPO3.Viewport.ContentCardsis no longer supported
Any TYPO3 installations using custom extensions based on ExtJS which rely on the above mentioned components.
There is no migration available.