TYPO3 Core

I was trying to find a signal to use when an action was called in ext:form.
There was no signal in ext:form, but in ActionController which ext:form extends I found the signal "beforeCallActionMethod".
To connect to this signal, I have to define the class TYPO3\CMS\Extbase\Mvc\Controller\ActionController, but that also means that on every action call on any extbase class which is extending ActionController, my slot is called.

My suggestion is to add another signal dispatch, but using get_called_class() instead of the CLASS constant.

Index: public/typo3/sysext/extbase/Classes/Mvc/Controller/ActionController.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- public/typo3/sysext/extbase/Classes/Mvc/Controller/ActionController.php    (date 1564749545000)
+++ public/typo3/sysext/extbase/Classes/Mvc/Controller/ActionController.php    (date 1564749545000)
@@ -337,6 +337,7 @@
     protected function emitBeforeCallActionMethodSignal(array $preparedArguments)
     {
         $this->signalSlotDispatcher->dispatch(__CLASS__, 'beforeCallActionMethod', [static::class, $this->actionMethodName, $preparedArguments]);
+        if(get_called_class() !== __CLASS__) $this->signalSlotDispatcher->dispatch(get_called_class(), 'beforeCallActionMethod', [static::class, $this->actionMethodName, $preparedArguments]);
     }

     /**