formatted deprecation message

Datagrid/ListMapper.php

@@ -78,7 +78,11 @@ class ListMapper extends BaseMapper
         // Change deprecated inline action "view" to "show"
         if ($name == '_action' && $type == 'actions') {
             if (isset($fieldDescriptionOptions['actions']['view'])) {
-                @trigger_error('Inline action "view" is deprecated since version 2.2.4 and will be removed in 4.0. Use inline action "show" instead.', E_USER_DEPRECATED);
+                @trigger_error(
+                    'Inline action "view" is deprecated since version 2.2.4 and will be removed in 4.0. '
+                    .'Use inline action "show" instead.',
+                    E_USER_DEPRECATED
+                );
 
                 $fieldDescriptionOptions['actions']['show'] = $fieldDescriptionOptions['actions']['view'];