Fix issuable state indicator

Now the issuable reference check works only in project scope, if we
reference an issuable from a non-project resource (e.g. epics), then
project is not set, and there is mismatch in generated issue references.

This patch enables issuable reference state check also from group scope.

Closes gitlab-ee#4683
Related to #30916

changelogs/unreleased/jprovazn-issueref.yml

+---
+title: Display state indicator for issuable references in non-project scope (e.g.
+  when referencing issuables from group scope).
+merge_request:
+author:
+type: fixed

lib/banzai/filter/issuable_state_filter.rb

@@ -17,7 +17,7 @@ module Banzai
         issuables.each do |node, issuable|
           next if !can_read_cross_project? && issuable.project != project
-          if VISIBLE_STATES.include?(issuable.state) && node.inner_html == issuable.reference_link_text(project)
+          if VISIBLE_STATES.include?(issuable.state) && issuable_reference?(node.inner_html, issuable)
             node.content += " (#{issuable.state})"
           end
         end
@@ -27,6 +27,10 @@ module Banzai
       private
+      def issuable_reference?(text, issuable)
+        text == issuable.reference_link_text(project || group)
+      end
+
       def can_read_cross_project?
         Ability.allowed?(current_user, :read_cross_project)
       end
@@ -38,6 +42,10 @@ module Banzai
       def project
         context[:project]
       end
+
+      def group
+        context[:group]
+      end
     end
   end
 end

spec/lib/banzai/filter/issuable_state_filter_spec.rb

@@ -8,6 +8,7 @@ describe Banzai::Filter::IssuableStateFilter do
   let(:context) { { current_user: user, issuable_state_filter_enabled: true } }
   let(:closed_issue) { create_issue(:closed) }
   let(:project) { create(:project, :public) }
+  let(:group) { create(:group) }
   let(:other_project) { create(:project, :public) }
   def create_link(text, data)
@@ -77,6 +78,13 @@ describe Banzai::Filter::IssuableStateFilter do
     expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)} (closed)")
   end
+  it 'handles references from group scopes' do
+    link = create_link(closed_issue.to_reference(other_project), issue: closed_issue.id, reference_type: 'issue')
+    doc = filter(link, context.merge(project: nil, group: group))
+
+    expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)} (closed)")
+  end
+
   it 'skips cross project references if the user cannot read cross project' do
     expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
     link = create_link(closed_issue.to_reference(other_project), issue: closed_issue.id, reference_type: 'issue')