Skip NullToStrictStringFuncCallArgRector on CalendarApiFeedType

987ae75 removed the (string) casts around preg_match / preg_replace /
trim in applyModifiersToEvents because they silently turned a
preg_replace null return (PCRE runtime error) into an empty title,
letting an event through with no filter applied. Rector wants the
casts back; applying them re-introduces the silent coercion the
commit specifically set out to remove. Suppressing the rule on this
file alone is the honest answer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: turegjorup

rector.php

@@ -5,6 +5,7 @@
 use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
 use Rector\Config\RectorConfig;
 use Rector\Doctrine\Set\DoctrineSetList;
+use Rector\Php81\Rector\FuncCall\NullToStrictStringFuncCallArgRector;
 use Rector\Set\ValueObject\LevelSetList;
 use Rector\Symfony\Set\SymfonySetList;
 
@@ -28,4 +29,13 @@
         SymfonySetList::SYMFONY_63,
         SymfonySetList::SYMFONY_CODE_QUALITY,
         SymfonySetList::SYMFONY_CONSTRUCTOR_INJECTION,
+    ])
+    // The (string) casts Rector wants here would re-introduce the silent
+    // null→"" coercion that 987ae75c removed: the title-modifier path is a
+    // correctness boundary, and on PCRE error the event is omitted with a
+    // log rather than passed through with an unfiltered title.
+    ->withSkip([
+        NullToStrictStringFuncCallArgRector::class => [
+            __DIR__.'/src/Feed/CalendarApiFeedType.php',
+        ],
     ]);