From edf85b820d4d281b281b862e3f66f950616eb62c Mon Sep 17 00:00:00 2001
From: Jimmy Praet <jimmy.praet@telenet.be>
Date: Sat, 12 Feb 2022 13:24:49 +0100
Subject: [PATCH] Fix source code line highlighting (#18729) (#18740)

Backport #18729

When the issues repo unit is disabled, or an external issue tracker is used, there is no "a.ref-in-new-issue".

Fixes #18721
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
---
 web_src/js/features/repo-code.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/web_src/js/features/repo-code.js b/web_src/js/features/repo-code.js
index 1855f86b41..96a923571f 100644
--- a/web_src/js/features/repo-code.js
+++ b/web_src/js/features/repo-code.js
@@ -15,11 +15,14 @@ function selectRange($list, $select, $from) {
   const $issue = $('a.ref-in-new-issue');
   const $copyPermalink = $('a.copy-line-permalink');
 
-  if ($issue.length === 0 || $copyPermalink.length === 0) {
+  if ($copyPermalink.length === 0) {
     return;
   }
 
-  const updateIssueHref = function(anchor) {
+  const updateIssueHref = function (anchor) {
+    if ($issue.length === 0) {
+      return;
+    }
     let href = $issue.attr('href');
     href = `${href.replace(/%23L\d+$|%23L\d+-L\d+$/, '')}%23${anchor}`;
     $issue.attr('href', href);