Breaking: #107518 - Removed "initializeFormElement" hook 

See forge#107518

Description 

The hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['initializeFormElement'] has been removed in favor of the PSR-14 event \TYPO3\CMS\Form\Event\BeforeRenderableIsAddedToFormEvent .

Impact 

Hook implementations registered under initializeFormElement are no longer executed in TYPO3 v14.0 and later.

Affected installations 

TYPO3 installations with custom extensions using this hook are affected. The extension scanner reports any usage as a weak match.

Migration 

The hook was removed without a deprecation phase to allow extensions to work with both TYPO3 v13 (using the hook) and TYPO3 v14+ (using the new event) simultaneously.

Use the PSR-14 event instead to influence form element initialization. Since the event is dispatched at a later point, it allows more extensive modifications than the previous hook.