Deprecation: #84387 - Deprecated method and property in SchedulerModuleController 

See forge#84387

Description 

The property $CMD and the method addMessage() in the SchedulerModuleController have been marked as deprecated and will be removed in TYPO3 v10.

Impact 

Accessing the property or calling the method will trigger a PHP E_USER_DEPRECATED error.

Affected Installations 

Third party code which accesses the property directly or calls the method.

Migration 

Instead of accessing the property SchedulerModuleController::$CMD, the method getCurrentAction() must be used which returns an instance of the \TYPO3\CMS\Scheduler\Task\Enumeration\Action enumeration.

Instead of calling the method SchedulerModuleController::addMessage(), in your additional field providers you can now extend \TYPO3\CMS\Scheduler\AbstractAdditionalFieldProvider which provides a method addMessage() with the same API like before.