Move the format conversion and EXIF removal into SaveChunk

See #6361 (comment)

Author: dtdesign

wcfsetup/install/files/lib/system/endpoint/controller/core/files/GenerateThumbnails.class.php

@@ -28,9 +28,6 @@ public function __invoke(ServerRequestInterface $request, array $variables): Res
     {
         $file = Helper::fetchObjectFromRequestParameter($variables['id'], File::class);
 
-        $file = FileProcessor::getInstance()->generateWebpVariant($file);
-        $file = FileProcessor::getInstance()->convertImageFormat($file);
-        $file = FileProcessor::getInstance()->stripExif($file);
         FileProcessor::getInstance()->generateThumbnails($file);
 
         $thumbnails = [];

wcfsetup/install/files/lib/system/endpoint/controller/core/files/upload/SaveChunk.class.php

@@ -133,15 +133,17 @@ public function __invoke(ServerRequestInterface $request, array $variables): Res
                 }
             }
 
+            if ($file->isImage()) {
+                $file = FileProcessor::getInstance()->generateWebpVariant($file);
+                $file = FileProcessor::getInstance()->convertImageFormat($file);
+                $file = FileProcessor::getInstance()->stripExif($file);
+            }
+
             $generateThumbnails = false;
             if ($processor !== null && $file->isImage()) {
                 $thumbnailFormats = $processor->getThumbnailFormats();
                 if ($thumbnailFormats !== []) {
                     $generateThumbnails = true;
-                } else if (\IMAGE_CONVERT_FORMAT !== 'keep' || \IMAGE_STRIP_EXIF) {
-                    // The action to generate thumbnails implicitly handles the
-                    // format conversion and EXIF removal.
-                    $generateThumbnails = true;
                 }
             }