Ticket #46134: 46134.diff

src/wp-includes/theme.php

@@ -1075 +1075 @@
         $header      = get_custom_header();
         $header->url = get_header_image();
 
+        /**
+         * Filters the markup of header images setup object.
+         *
+         * @since TODO
+         *
+         * @param object $header The custom header object returned by 'get_custom_header()' with 'get_header_image()' image URL.
+         * @param array  $attr   Array of the attributes for the image tag.
+         */
+        $header = apply_filters( 'header_image_tag_object', $header, $attr );
+
         if ( ! $header->url ) {
                 return '';
         }