New in version 10.4: This event replaces the
hook from the pibase plugin.
Allows to inject custom variables into the login form.
Changed in version 12.0: The interface
TYPO3\CMS\Extbase\Mvc\View\ViewInterface has been
removed with v12. The
getView() method signature has been changed
TYPO3Fluid\Fluid\View\ViewInterface with the v12 release.