Ticket #42549: 42549.1.diff

src/wp-includes/widgets/class-wp-widget-media-gallery.php

@@ -117 +117 @@
                         $instance,
                         array(
                                 'link' => $instance['link_type'],
+                                'id' => is_singular() ? get_queried_object_id() : 0,
                         )
                 );
 
@@ -254 +255 @@
                                 }
                         }
                         return true;
+                } elseif ( is_singular() ) {
+                        $children = get_children( array(
+                                'id'             => get_queried_object_id(),
+                                'post_status'    => 'inherit',
+                                'post_type'      => 'attachment',
+                                'post_mime_type' => 'image',
+                        ) );
+                        if ( ! empty( $children ) ) {
+                                return true;
+                        }
                 }
                 return false;
         }