Move wp_start_template_enhancement_output_buffer to priority 1000

Author: westonruter

src/wp-includes/default-filters.php

@@ -422,7 +422,7 @@
 add_action( 'do_all_pings', 'generic_ping', 10, 0 );
 add_action( 'do_robots', 'do_robots' );
 add_action( 'do_favicon', 'do_favicon' );
-add_action( 'wp_before_include_template', 'wp_start_template_enhancement_output_buffer' );
+add_action( 'wp_before_include_template', 'wp_start_template_enhancement_output_buffer', 1000 ); // Late priority to let `wp_template_enhancement_output_buffer` filters and `wp_send_late_headers` actions be registered.
 add_action( 'set_comment_cookies', 'wp_set_comment_cookies', 10, 3 );
 add_action( 'sanitize_comment_cookies', 'sanitize_comment_cookies' );
 add_action( 'init', 'smilies_init', 5 );