[BUGFIX] Fetch original file from file reference in ThumbnailViewHelper

Using `treatIdAsReference` it's also possible to
pass a file reference uid to the ThumbnailViewHelper.

To allow processing such reference, the original
file is now fetched to call `process` on it.

Resolves: #102571
Releases: main, 12.4
Change-Id: If2f9cad99045d19c6dcc4b95bba6b7de71405956
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82375


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>

Build/phpstan/phpstan-baseline.neon

@@ -200,11 +200,6 @@ parameters:
 			count: 1
 			path: ../../typo3/sysext/backend/Classes/View/BackendLayout/ContentFetcher.php
 
-		-
-			message: "#^Call to an undefined method TYPO3\\\\CMS\\\\Core\\\\Resource\\\\FileInterface\\:\\:process\\(\\)\\.$#"
-			count: 1
-			path: ../../typo3/sysext/backend/Classes/ViewHelpers/ThumbnailViewHelper.php
-
 		-
 			message: "#^Parameter \\#2 \\$attributeValue of method TYPO3Fluid\\\\Fluid\\\\Core\\\\ViewHelper\\\\TagBuilder\\:\\:addAttribute\\(\\) expects array\\|string\\|Traversable\\|null, TYPO3\\\\CMS\\\\Core\\\\Imaging\\\\ImageManipulation\\\\Area given\\.$#"
 			count: 1

typo3/sysext/backend/Classes/ViewHelpers/ThumbnailViewHelper.php

@@ -133,6 +133,11 @@ final class ThumbnailViewHelper extends AbstractTagBasedViewHelper
                 }
             }
 
+            if (is_callable([$image, 'getOriginalFile'])) {
+                // Get the original file from the file reference
+                $image = $image->getOriginalFile();
+            }
+
             $processedFile = $image->process($this->arguments['context'], $processingInstructions);
             $imageUri = $processedFile->getPublicUrl();