fix: preview thumbnail return type (#956)

Author: lukmzig

src/Asset/Service/ThumbnailService.php

@@ -30,11 +30,12 @@
 use Pimcore\Bundle\StudioBackendBundle\Util\Constant\Thumbnails;
 use Pimcore\Bundle\StudioBackendBundle\Util\Trait\ConsoleExecutableTrait;
 use Pimcore\Model\Asset\Document;
+use Pimcore\Model\Asset\Document\ImageThumbnailInterface as DocumentThumbnail;
 use Pimcore\Model\Asset\Image;
 use Pimcore\Model\Asset\Image\Thumbnail\Config as ImageThumbnailConfig;
 use Pimcore\Model\Asset\Image\ThumbnailInterface;
 use Pimcore\Model\Asset\Video;
-use Pimcore\Model\Asset\Video\ImageThumbnailInterface;
+use Pimcore\Model\Asset\Video\ImageThumbnailInterface as VideoImageThumbnail;
 use Pimcore\Model\Asset\Video\Thumbnail\Config as VideoThumbnailConfig;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 use Symfony\Component\HttpFoundation\ResponseHeaderBag;
@@ -109,7 +110,7 @@ public function getImagePreviewThumbnail(Image $image): ThumbnailInterface
     /**
      * @throws InvalidThumbnailException
      */
-    public function getAssetImagePreviewThumbnail(Video|Document $asset): ImageThumbnailInterface
+    public function getAssetImagePreviewThumbnail(Video|Document $asset): DocumentThumbnail|VideoImageThumbnail
     {
         $thumbnailConfig = $this->getSystemImageThumbnailConfig();
         if ($thumbnailConfig === null) {

src/Asset/Service/ThumbnailServiceInterface.php

@@ -22,10 +22,11 @@
 use Pimcore\Bundle\StudioBackendBundle\Exception\Api\InvalidThumbnailException;
 use Pimcore\Bundle\StudioBackendBundle\Exception\Api\ThumbnailResizingFailedException;
 use Pimcore\Model\Asset\Document;
+use Pimcore\Model\Asset\Document\ImageThumbnailInterface as DocumentThumbnail;
 use Pimcore\Model\Asset\Image;
 use Pimcore\Model\Asset\Image\ThumbnailInterface;
 use Pimcore\Model\Asset\Video;
-use Pimcore\Model\Asset\Video\ImageThumbnailInterface;
+use Pimcore\Model\Asset\Video\ImageThumbnailInterface as VideoImageThumbnail;
 use Pimcore\Model\Asset\Video\Thumbnail\Config as VideoThumbnailConfig;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
 
@@ -56,7 +57,7 @@ public function getImagePreviewThumbnail(Image $image): ThumbnailInterface;
     /**
      * @throws InvalidThumbnailException
      */
-    public function getAssetImagePreviewThumbnail(Video|Document $asset): ImageThumbnailInterface;
+    public function getAssetImagePreviewThumbnail(Video|Document $asset): DocumentThumbnail|VideoImageThumbnail;
 
     /**
      * @throws InvalidThumbnailException