Ticket #19292: 19292-dont-update-slug-sanitize-type-on-update.diff

wp-includes/post.php

@@ -2490 +2490 @@
                 else
                         $post_name = '';
         } else {
-                $post_name = sanitize_title($post_name);
+                // On updates, we need to check to see if it's using an old sanitization context, or the newer Save context
+                $check_name = sanitize_title(urlencode($post_name), '', 'query'); // sanitize_title_for_query(), but spelt out here for readability
+                if ( $update && strtolower(urlencode($post_name)) == $check_name )
+                        $post_name = $check_name;
+                else // slug has changed or uses newer (default) sanitization
+                        $post_name = sanitize_title($post_name);
         }
 
         // If the post date is empty (due to having been new or a draft) and status is not 'draft' or 'pending', set date to now
@@ -3153 +3158 @@
         $page_path = str_replace('%20', ' ', $page_path);
         $parts = explode( '/', trim( $page_path, '/' ) );
         $parts = array_map( 'esc_sql', $parts );
-        $parts = array_map( 'sanitize_title', $parts );
+        $parts = array_map( 'sanitize_title_for_query', $parts );
 
         $in_string = "'". implode( "','", $parts ) . "'";
         $post_type_sql = $post_type;