ENGCOM-8005: Fix new iTxt && zTxt segment creation for PNG image XMP && IPTC segments #29475

 - Merge Pull Request #29475 from Nazar65/magento2:ASI-1743
 - Merged commits:
   1. bb1ba14
   2. a156298
   3. f7e9830
   4. dd9a41f
   5. f165c8f
   6. e0f3252
   7. f3d831d
   8. a9fda1e

Author: magento-engcom-team

app/code/Magento/MediaGalleryMetadata/Model/Png/Segment/WriteIptc.php

@@ -71,11 +71,9 @@ public function execute(FileInterface $file, MetadataInterface $metadata): FileI
         }
 
         if (empty($pngIptcSegments)) {
-            $segments[] =  $this->createPngIptcSegment($metadata);
-
             return $this->fileFactory->create([
                 'path' => $file->getPath(),
-                'segments' => $segments
+                'segments' => $this->insertPngIptcSegment($segments, $this->createPngIptcSegment($metadata))
             ]);
         }
 
@@ -89,6 +87,24 @@ public function execute(FileInterface $file, MetadataInterface $metadata): FileI
         ]);
     }
 
+    /**
+     * Insert IPTC segment to image png segments before IEND chunk
+     *
+     * @param SegmentInterface[] $segments
+     * @param SegmentInterface $iptcSegment
+     * @return SegmentInterface[]
+     */
+    private function insertPngIptcSegment(array $segments, SegmentInterface $iptcSegment): array
+    {
+        $iendSegmentIndex = count($segments) - 1;
+
+        return array_merge(
+            array_slice($segments, 0, $iendSegmentIndex),
+            [$iptcSegment],
+            array_slice($segments, $iendSegmentIndex)
+        );
+    }
+
     /**
      * Create new  zTXt segment with metadata
      *

app/code/Magento/MediaGalleryMetadata/Model/Png/Segment/WriteXmp.php

@@ -97,15 +97,20 @@ public function execute(FileInterface $file, MetadataInterface $metadata): FileI
     }
 
     /**
-     * Insert XMP segment to image png segments (at position 1)
+     * Insert XMP segment to image png segments before IEND chunk
      *
      * @param SegmentInterface[] $segments
      * @param SegmentInterface $xmpSegment
      * @return SegmentInterface[]
      */
     private function insertPngXmpSegment(array $segments, SegmentInterface $xmpSegment): array
     {
-        return array_merge(array_slice($segments, 0, 2), [$xmpSegment], array_slice($segments, 2));
+        $iendSegmentIndex = count($segments) - 1;
+        return array_merge(
+            array_slice($segments, 0, $iendSegmentIndex),
+            [$xmpSegment],
+            array_slice($segments, $iendSegmentIndex)
+        );
     }
 
     /**