Ticket #18790: 18790.patch

wp-includes/theme.php

@@ -1241 +1241 @@
                                 $args[0] = array_intersect( $args[0], array_keys( get_post_format_slugs() ) );
                         break;
 
+                case 'post-thumbnails' :
+                        if ( is_array( $args[0] ) && isset( $_wp_theme_features['post-thumbnails'] ) ) {
+                                if ( is_array( $_wp_theme_features['post-thumbnails'][0] ) )
+                                        $args[0] = array_merge( $_wp_theme_features['post-thumbnails'][0], $args[0] );
+                                elseif ( true === $_wp_theme_features['post-thumbnails'] )
+                                        $args = true;
+                        }
+                        break;
+
                 case 'custom-header-uploads' :
                         return add_theme_support( 'custom-header', array( 'uploads' => true ) );
                         break;