Ticket #48477: 48477.diff

image.php

@@ -399 +399 @@
 
         $new_sizes = array_filter( array_merge( $priority, $new_sizes ) );
 
+        /**
+         * Fires before creating image sub-sizes.
+         *
+         * @since 5.3.0
+         *
+         * @param array  $new_sizes     Array defining what sizes to create.
+         * @param string $file          Full path to the image file.
+         * @param array  $image_meta    The attachment meta data array.
+         * @param int    $attachment_id Attachment Id to process.
+         */
+        do_action( 'wp_before_make_subsizes', $new_sizes, $file, $image_meta, $attachment_id );
+
         $editor = wp_get_image_editor( $file );
 
         if ( is_wp_error( $editor ) ) {