[BUGFIX] Use real finisher identifier in form element variants

Use the real finisher identifiers as they are configured in the
form definition instead the finisher implementation class name.
This requires a change of the public AbstractFinisher implementation
which implements the FinisherInterface. The interface is not changed,
as this would be a breaking change. Therefore, the existence of the
new method is checked. If it does not exist in a finisher
implementation, a fallback to the previous behavior happens.

Releases: master, 9.5
Resolves: #87615
Change-Id: I962502f0601845a5f9793751e87c97b3b902caa1
Reviewed-on: https://review.typo3.org/59610
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

typo3/sysext/form/Classes/Domain/Finishers/AbstractFinisher.php

@@ -94,6 +94,14 @@ public function __construct(string $finisherIdentifier = '')
         $this->shortFinisherIdentifier = preg_replace('/Finisher$/', '', $this->finisherIdentifier);
     }
 
+    /**
+     * @return string
+     */
+    public function getFinisherIdentifier(): string
+    {
+        return $this->finisherIdentifier;
+    }
+
     /**
      * @param array $options configuration options in the format ['option1' => 'value1', 'option2' => 'value2', ...]
      */

typo3/sysext/form/Classes/Domain/Runtime/FormRuntime.php

@@ -1046,8 +1046,12 @@ protected function getConditionResolver(): Resolver
 
         $finisherIdentifier = '';
         if ($this->getCurrentFinisher() !== null) {
-            $finisherIdentifier = (new \ReflectionClass($this->getCurrentFinisher()))->getShortName();
-            $finisherIdentifier = preg_replace('/Finisher$/', '', $finisherIdentifier);
+            if (method_exists($this->getCurrentFinisher(), 'getFinisherIdentifier')) {
+                $finisherIdentifier = $this->getCurrentFinisher()->getFinisherIdentifier();
+            } else {
+                $finisherIdentifier = (new \ReflectionClass($this->getCurrentFinisher()))->getShortName();
+                $finisherIdentifier = preg_replace('/Finisher$/', '', $finisherIdentifier);
+            }
         }
 
         return GeneralUtility::makeInstance(