Adds v-pre to code blocks in comments

Closes #22911

2 files changed, 3 insertions, 2 deletions

diff --git a/lib/banzai/filter/sanitization_filter.rb b/lib/banzai/filter/sanitization_filter.rb
index 2470362e019..af1e575fc89 100644
--- a/lib/banzai/filter/sanitization_filter.rb
+++ b/lib/banzai/filter/sanitization_filter.rb
@@ -25,7 +25,7 @@ module Banzai
         return if customized?(whitelist[:transformers])
 
         # Allow code highlighting
-        whitelist[:attributes]['pre'] = %w(class)
+        whitelist[:attributes]['pre'] = %w(class v-pre)
         whitelist[:attributes]['span'] = %w(class)
 
         # Allow table alignment
diff --git a/lib/banzai/filter/syntax_highlight_filter.rb b/lib/banzai/filter/syntax_highlight_filter.rb
index fcdb496aed2..bb6b4582e4f 100644
--- a/lib/banzai/filter/syntax_highlight_filter.rb
+++ b/lib/banzai/filter/syntax_highlight_filter.rb
@@ -30,7 +30,8 @@ module Banzai
           # users can still access an issue/comment/etc.
         end
 
-        highlighted = %(<pre class="#{css_classes}"><code>#{code}</code></pre>)
+        highlighted = %(<pre class="#{css_classes}" v-pre="true"><code>#{code}</code></pre>)
+        puts highlighted
 
         # Extracted to a method to measure it
         replace_parent_pre_element(node, highlighted)