Fix group issues list not showing subgroup issues

When:
- The feature flag `vue_issues_list` is enabled
- A group has no issues
- A subgroup of the group has issues
Then the group issues list does not show the subgroup issues.
The expected behaviour is that it does show the subgroup issues,
which this commit fixes.

app/controllers/groups_controller.rb

@@ -212,7 +212,7 @@ class GroupsController < Groups::ApplicationController
   def issues
     return super if !html_request? || Feature.disabled?(:vue_issues_list, group, default_enabled: :yaml)
 
-    @has_issues = IssuesFinder.new(current_user, group_id: group.id).execute
+    @has_issues = IssuesFinder.new(current_user, group_id: group.id, include_subgroups: true).execute
       .non_archived
       .exists?
 

spec/features/groups/issues_spec.rb

@@ -108,6 +108,22 @@ RSpec.describe 'Group issues page' do
     end
   end
 
+  context 'group with no issues', :js do
+    let!(:group_with_no_issues) { create(:group) }
+    let!(:subgroup_with_issues) { create(:group, parent: group_with_no_issues) }
+    let!(:subgroup_project) { create(:project, :public, group: subgroup_with_issues) }
+    let!(:subgroup_issue) { create(:issue, project: subgroup_project) }
+
+    before do
+      stub_feature_flags(vue_issues_list: true)
+      visit issues_group_path(group_with_no_issues)
+    end
+
+    it 'shows issues from subgroups on issues list' do
+      expect(page).to have_text subgroup_issue.title
+    end
+  end
+
   context 'projects with issues disabled' do
     describe 'issue dropdown' do
       let(:user_in_group) { create(:group_member, :maintainer, user: create(:user), group: group ).user }