Handle old format state files

There was an intermediate serialisation format that may be saved in some instances. Detect and handle.

Author: lucasnetau

src/StateMachine/AEventProcessor.php

@@ -17,6 +17,7 @@
 use Evenement\EventEmitterTrait;
 use Exception;
 use RuntimeException;
+use function array_key_exists;
 use function count;
 use function in_array;
 use function array_key_first;
@@ -423,6 +424,12 @@ public function unserialize($data)
      * @throws Exception
      */
     public function __unserialize(array $data) {
+        //Detect old serialisation format
+        if (count($data) === 1 && array_key_exists('data', $data)) {
+            $this->unserialize($data['data']);
+            return;
+        }
+        
         $this->unresolved_events = $data['events'];
 
         $this->instanceId = $data['instanceId'] ?? $this->generateInstanceId(); //Generate a new ID if we don't have one serialized
@@ -442,4 +449,4 @@ public function resolveEvents($events)
         $this->consumedEvents = array_map(function($event_id) use ($events) { return $events[$event_id]; } , $this->unresolved_events);
         unset($this->unresolved_events);
     }
-}
+}