bug #27662 [HttpKernel] fix handling of nested Error instances (xabbuh)

This PR was merged into the 3.4 branch.

Discussion
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[HttpKernel] fix handling of nested Error instances

| Q             | A
| ------------- | ---
| Branch?       | 4.1
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #27613
| License       | MIT
| Doc PR        |

Commits
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a6696d0 fix handling of nested Error instances

src/Symfony/Component/HttpKernel/EventListener/ExceptionListener.php

@@ -64,7 +64,7 @@ public function onKernelException(GetResponseForExceptionEvent $event)
                 }
             }
 
-            $prev = new \ReflectionProperty('Exception', 'previous');
+            $prev = new \ReflectionProperty($wrapper instanceof \Exception ? \Exception::class : \Error::class, 'previous');
             $prev->setAccessible(true);
             $prev->setValue($wrapper, $exception);