From f91bb745d6f64d7f8eb4d3270fe740911bce4251 Mon Sep 17 00:00:00 2001
From: zeripath <art27@cantab.net>
Date: Sat, 12 Sep 2020 17:00:48 +0100
Subject: [PATCH] Don't replace underscores in auto-generated IDs in goldmark
 (#12805)

Fix #12196

Signed-off-by: Andrew Thornton <art27@cantab.net>
---
 modules/markup/common/footnote.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/markup/common/footnote.go b/modules/markup/common/footnote.go
index ad4cd7f2e1..9baf8a4998 100644
--- a/modules/markup/common/footnote.go
+++ b/modules/markup/common/footnote.go
@@ -34,7 +34,7 @@ func CleanValue(value []byte) []byte {
 	needsDash := false
 	for _, r := range rs {
 		switch {
-		case unicode.IsLetter(r) || unicode.IsNumber(r):
+		case unicode.IsLetter(r) || unicode.IsNumber(r) || r == '_':
 			if needsDash && len(result) > 0 {
 				result = append(result, '-')
 			}