Ticket #21753: 21753.patch

src/wp-includes/default-filters.php

@@ -162 +162 @@
 add_filter( 'the_title_rss',      'esc_html'                      );
 add_filter( 'the_content_rss',    'ent2ncr',                    8 );
 add_filter( 'the_content_feed',   'wp_staticize_emoji'            );
-add_filter( 'the_excerpt_rss',    'convert_chars'                 );
-add_filter( 'the_excerpt_rss',    'ent2ncr',                    8 );
 add_filter( 'comment_author_rss', 'ent2ncr',                    8 );
 add_filter( 'comment_text_rss',   'ent2ncr',                    8 );
 add_filter( 'comment_text_rss',   'esc_html'                      );

src/wp-includes/feed.php

@@ -215 +215 @@
  */
 function the_excerpt_rss() {
         $output = get_the_excerpt();
+        /** This filter is documented in wp-includes/post-template.php */
+        $output = apply_filters( 'the_excerpt', $output );
+        $output = str_replace( ']]>', ']]>', $output );
         /**
          * Filter the post excerpt for a feed.
          *