Links for redmine issue references are generated correctly again

CHANGELOG

@@ -40,6 +40,7 @@ v 8.8.0 (unreleased)
 v 8.7.4
   - Fix always showing build notification message when switching between merge requests
   - Fix links on wiki pages for relative url setups. !4026 (Artem Sidorenko)
+  - Links for Redmine issue references are generated correctly again (Benedikt Huss)
 
 v 8.7.3
   - Emails, Gitlab::Email::Message, Gitlab::Diff, and Premailer::Adapter::Nokogiri are now instrumented

lib/banzai/filter/issue_reference_filter.rb

@@ -10,6 +10,9 @@ def self.object_class
       end
 
       def self.user_can_see_reference?(user, node, context)
+        # It is not possible to check access rights for external issue trackers
+        return true if context[:project].try(:external_issue_tracker)
+ 
         issue = Issue.find(node.attr('data-issue')) rescue nil
         Ability.abilities.allowed?(user, :read_issue, issue)
       end