See Issue #64059
In the process of refactoring prototype/scripta.culo.us code and migrate these to an AMD module, the tree component and its drag&drop parts have been migrated to a RequireJS / jQuery module.
The page tree filter functionality of the prototype tree, which is not used in the TYPO3 core, was removed from the tree component.
typo3/js/tree.js has been removed, the replacement code, based on jQuery is located under
Any usages in third party extensions that include
js/tree.js will fail, as the tree component has been removed.
Any extension using the filter part of the tree.js component will not work.
Any installation with its own backend module using the tree component from the core.
Rewrite any needed logic for filtering, and include the RequireJS module like in e.g.
FileSystemNavigationFrameController.php, to use the tree component. If the old code is needed, the
and prototype need to be included as part of the extension, not from the core.