Attachments: dedupe earlier to prevent incorrect max_media

includes/transformer/class-post.php

@@ -185,7 +185,6 @@ class Post {
 			$blocks = \parse_blocks( $this->wp_post->post_content );
 			$media_ids = self::get_media_ids_from_blocks( $blocks, $media_ids, $max_media );
 		}
-		$media_ids = \array_unique( $media_ids );
 
 		return \array_filter( \array_map( array( self::class, 'wp_attachment_to_activity_attachment' ), $media_ids ) );
 	}
@@ -279,6 +278,9 @@ class Post {
 					break;
 			}
 
+			// depupe
+			$media_ids = \array_unique( $media_ids );
+
 			// stop doing unneeded work
 			if ( count( $media_ids ) >= $max_media ) {
 				break;