symfony-fs-mirror.patch

diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 3498e7f9fb..4d68341136 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -497,16 +497,17 @@ class Filesystem
      *  - existing files in the target directory will be overwritten, except if they are newer (see the `override` option)
      *  - files in the target directory that do not exist in the source directory will not be deleted (see the `delete` option)
      *
-     * @param \Traversable|null $iterator Iterator that filters which files and directories to copy, if null a recursive iterator is created
+     * @param \Traversable|null $originIterator Iterator that filters which files and directories to copy, if null a recursive iterator is created
      * @param array             $options  An array of boolean options
      *                                    Valid options are:
      *                                    - $options['override'] If true, target files newer than origin files are overwritten (see copy(), defaults to false)
      *                                    - $options['copy_on_windows'] Whether to copy files instead of links on Windows (see symlink(), defaults to false)
      *                                    - $options['delete'] Whether to delete files that are not in the source directory (defaults to false)
+     * @param \Traversable|null $targetIterator Iterator that filters which files and directory in target directory to delete if not in source directory (if $options['delete'] is true)
      *
      * @throws IOException When file type is unknown
      */
-    public function mirror(string $originDir, string $targetDir, \Traversable $iterator = null, array $options = [])
+    public function mirror(string $originDir, string $targetDir, \Traversable $originIterator = null, array $options = [], \Traversable $targetIterator = null)
     {
         $targetDir = rtrim($targetDir, '/\\');
         $originDir = rtrim($originDir, '/\\');
@@ -518,7 +519,7 @@ class Filesystem
 
         // Iterate in destination folder to remove obsolete entries
         if ($this->exists($targetDir) && isset($options['delete']) && $options['delete']) {
-            $deleteIterator = $iterator;
+            $deleteIterator = $targetIterator;
             if (null === $deleteIterator) {
                 $flags = \FilesystemIterator::SKIP_DOTS;
                 $deleteIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($targetDir, $flags), \RecursiveIteratorIterator::CHILD_FIRST);
@@ -534,15 +535,15 @@ class Filesystem
 
         $copyOnWindows = $options['copy_on_windows'] ?? false;
 
-        if (null === $iterator) {
+        if (null === $originIterator) {
             $flags = $copyOnWindows ? \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::FOLLOW_SYMLINKS : \FilesystemIterator::SKIP_DOTS;
-            $iterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
+            $originIterator = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($originDir, $flags), \RecursiveIteratorIterator::SELF_FIRST);
         }
 
         $this->mkdir($targetDir);
         $filesCreatedWhileMirroring = [];
 
-        foreach ($iterator as $file) {
+        foreach ($originIterator as $file) {
             if ($file->getPathname() === $targetDir || $file->getRealPath() === $targetDir || isset($filesCreatedWhileMirroring[$file->getRealPath()])) {
                 continue;
             }