From 12b2dd309896d7ebecbba8677de6bc049c21a26c Mon Sep 17 00:00:00 2001
From: Marius Balteanu <marius.balteanu@zitec.com>
Date: Sun, 15 Aug 2021 20:57:38 +0000
Subject: [PATCH] Preserve the code block and remove the class from it when the
 language is not supported in CommonMark formatter (#35765, 32424).

git-svn-id: http://svn.redmine.org/redmine/trunk@21181 e93f8b46-1217-0410-a6f0-8f06a7374b81
---
 .../wiki_formatting/common_mark/syntax_highlight_filter.rb    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/redmine/wiki_formatting/common_mark/syntax_highlight_filter.rb b/lib/redmine/wiki_formatting/common_mark/syntax_highlight_filter.rb
index a027e6a17..316a7b8fd 100644
--- a/lib/redmine/wiki_formatting/common_mark/syntax_highlight_filter.rb
+++ b/lib/redmine/wiki_formatting/common_mark/syntax_highlight_filter.rb
@@ -38,8 +38,8 @@ module Redmine
               node.inner_html = html
               node["class"] = "#{lang} syntaxhl"
             else
-              # unsupported language, strip out the code tag
-              node.parent.inner_html = text
+              # unsupported language, remove the class attribute
+              node.remove_attribute("class")
             end
           end
           doc
-- 
2.39.5