[HttpKernel][ErrorHandler] Fix reading the SYMFONY_IDE env var

Author: nicolas-grekas

Debug/FileLinkFormatter.php

@@ -35,7 +35,8 @@ class FileLinkFormatter
      */
     public function __construct(string|array $fileLinkFormat = null, RequestStack $requestStack = null, string $baseDir = null, string|\Closure $urlFormat = null)
     {
-        $fileLinkFormat ??= $_SERVER['SYMFONY_IDE'] ?? '';
+        $fileLinkFormat ??= $_ENV['SYMFONY_IDE'] ?? $_SERVER['SYMFONY_IDE'] ?? '';
+
         if (!\is_array($fileLinkFormat) && $fileLinkFormat = (ErrorRendererInterface::IDE_LINK_FORMATS[$fileLinkFormat] ?? $fileLinkFormat) ?: \ini_get('xdebug.file_link_format') ?: get_cfg_var('xdebug.file_link_format') ?: false) {
             $i = strpos($f = $fileLinkFormat, '&', max(strrpos($f, '%f'), strrpos($f, '%l'))) ?: \strlen($f);
             $fileLinkFormat = [substr($f, 0, $i)] + preg_split('/&([^>]++)>/', substr($f, $i), -1, \PREG_SPLIT_DELIM_CAPTURE);

phpunit.xml.dist

@@ -10,6 +10,7 @@
 >
     <php>
         <ini name="error_reporting" value="-1" />
+        <env name="SYMFONY_IDE" value="" force="true" />
     </php>
 
     <testsuites>