Use Error.beforeRender and stop event propagation.

Author: markstory

src/Plugin.php

@@ -93,7 +93,7 @@ public function console(CommandCollection $commands): CommandCollection
     public function setDeprecationHandler($service)
     {
         if (!empty($service->getConfig('panels')['DebugKit.Deprecations'])) {
-            EventManager::instance()->on('Error.handled', function (EventInterface $event, PhpError $error) {
+            EventManager::instance()->on('Error.beforeRender', function (EventInterface $event, PhpError $error) {
                 $code = $error->getCode();
                 if ($code !== E_USER_DEPRECATED && $code !== E_DEPRECATED) {
                     return;
@@ -115,6 +115,7 @@ public function setDeprecationHandler($service)
                     'file' => $file,
                     'line' => $line,
                 ]);
+                $event->stopPropagation();
             });
         }
     }

tests/TestCase/PluginTest.php

@@ -41,12 +41,12 @@ public function testSetDeprecationHandler()
         $panel = new DeprecationsPanel();
 
         $error = new PhpError(E_USER_WARNING, 'ignored', __FILE__, __LINE__, []);
-        $event = new Event('Error.handled', null, ['error' => $error]);
+        $event = new Event('Error.beforeRender', null, ['error' => $error]);
         EventManager::instance()->dispatch($event);
 
         // No file/line in message.
         $error = new PhpError(E_USER_DEPRECATED, 'going away', __FILE__, __LINE__, []);
-        $event = new Event('Error.handled', null, ['error' => $error]);
+        $event = new Event('Error.beforeRender', null, ['error' => $error]);
         EventManager::instance()->dispatch($event);
 
         // Formatted like deprecationWarning()
@@ -57,7 +57,7 @@ public function testSetDeprecationHandler()
 You can disable all deprecation warnings by setting `Error.errorLevel` to `E_ALL & ~E_USER_DEPRECATED`.
 TEXT;
         $error = new PhpError(E_USER_DEPRECATED, $message, __FILE__, __LINE__, []);
-        $event = new Event('Error.handled', null, ['error' => $error]);
+        $event = new Event('Error.beforeRender', null, ['error' => $error]);
         EventManager::instance()->dispatch($event);
 
         $panel->shutdown($event);