Ticket #16230: 16230-category-slug-length-fix-v2.diff

wp-includes/taxonomy.php

@@ -1710 +1710 @@
 
         if ( 'slug' === $field ) {
                 $value = sanitize_title( $value );
+
+                /*
+                 * Enforce maximum slug length AFTER decoding.
+                 * This prevents URL-encoded or multibyte strings
+                 * from exceeding the 200 character limit and
+                 * breaking admin pagination queries.
+                 */
+                $decoded_slug = rawurldecode( $value );
+
+                if ( strlen( $decoded_slug ) > 200 ) {
+                        $decoded_slug = substr( $decoded_slug, 0, 200 );
+
+                        // Re-sanitize after truncation to ensure valid slug.
+                        $value = sanitize_title( $decoded_slug );
+                }
         }
 
         if ( 'db' === $context ) {