Fix invited group members not showing on group/project issues list

On the Haml group/project issues list page, when you select the
assignees token in the filtered search bar it shows invited
group members in the suggestions list.

This commit fixes the Vue group/project issues list to also
show invited group members.

Behind feature flag `vue_issues_list` defaulted to off

https://gitlab.com/gitlab-org/gitlab/-/issues/353899

app/assets/javascripts/issues/list/queries/search_users.query.graphql

@@ -3,7 +3,7 @@
 query searchUsers($fullPath: ID!, $search: String, $isProject: Boolean = false) {
   group(fullPath: $fullPath) @skip(if: $isProject) {
     id
-    groupMembers(search: $search) {
+    groupMembers(search: $search, relations: [DIRECT, INHERITED, SHARED_FROM_GROUPS]) {
       nodes {
         id
         user {
@@ -14,7 +14,7 @@ query searchUsers($fullPath: ID!, $search: String, $isProject: Boolean = false)
   }
   project(fullPath: $fullPath) @include(if: $isProject) {
     id
-    projectMembers(search: $search) {
+    projectMembers(search: $search, relations: [DIRECT, INHERITED, INVITED_GROUPS]) {
       nodes {
         id
         user {

spec/features/issues/filtered_search/dropdown_assignee_spec.rb

@@ -12,14 +12,14 @@ RSpec.describe 'Dropdown assignee', :js do
   let(:js_dropdown_assignee) { '#js-dropdown-assignee' }
   let(:filter_dropdown) { find("#{js_dropdown_assignee} .filter-dropdown") }
 
-  before do
-    project.add_maintainer(user)
-    sign_in(user)
+  describe 'behavior' do
+    before do
+      project.add_maintainer(user)
+      sign_in(user)
 
-    visit project_issues_path(project)
-  end
+      visit project_issues_path(project)
+    end
 
-  describe 'behavior' do
     it 'loads all the assignees when opened' do
       input_filtered_search('assignee:=', submit: false, extra_space: false)
 
@@ -35,6 +35,11 @@ RSpec.describe 'Dropdown assignee', :js do
 
   describe 'selecting from dropdown without Ajax call' do
     before do
+      project.add_maintainer(user)
+      sign_in(user)
+
+      visit project_issues_path(project)
+
       Gitlab::Testing::RequestBlockerMiddleware.block_requests!
       input_filtered_search('assignee:=', submit: false, extra_space: false)
     end
@@ -51,4 +56,60 @@ RSpec.describe 'Dropdown assignee', :js do
       expect_filtered_search_input_empty
     end
   end
+
+  context 'assignee suggestions' do
+    let!(:group) { create(:group) }
+    let!(:group_project) { create(:project, namespace: group) }
+    let!(:group_user) { create(:user) }
+
+    let!(:subgroup) { create(:group, parent: group) }
+    let!(:subgroup_project) { create(:project, namespace: subgroup) }
+    let!(:subgroup_project_issue) { create(:issue, project: subgroup_project) }
+    let!(:subgroup_user) { create(:user) }
+
+    let!(:subsubgroup) { create(:group, parent: subgroup) }
+    let!(:subsubgroup_project) { create(:project, namespace: subsubgroup) }
+    let!(:subsubgroup_user) { create(:user) }
+
+    let!(:invited_to_group_group) { create(:group) }
+    let!(:invited_to_group_group_user) { create(:user) }
+
+    let!(:invited_to_project_group) { create(:group) }
+    let!(:invited_to_project_group_user) { create(:user) }
+
+    before do
+      group.add_developer(group_user)
+      subgroup.add_developer(subgroup_user)
+      subsubgroup.add_developer(subsubgroup_user)
+      invited_to_group_group.add_developer(invited_to_group_group_user)
+      invited_to_project_group.add_developer(invited_to_project_group_user)
+
+      create(:group_group_link, shared_group: subgroup, shared_with_group: invited_to_group_group)
+      create(:project_group_link, project: subgroup_project, group: invited_to_project_group)
+
+      sign_in(subgroup_user)
+    end
+
+    it 'shows inherited, direct, and invited group members but not descendent members', :aggregate_failures do
+      visit issues_group_path(subgroup)
+
+      input_filtered_search('assignee:=', submit: false, extra_space: false)
+
+      expect(page).to have_text group_user.name
+      expect(page).to have_text subgroup_user.name
+      expect(page).to have_text invited_to_group_group_user.name
+      expect(page).not_to have_text subsubgroup_user.name
+      expect(page).not_to have_text invited_to_project_group_user.name
+
+      visit project_issues_path(subgroup_project)
+
+      input_filtered_search('assignee:=', submit: false, extra_space: false)
+
+      expect(page).to have_text group_user.name
+      expect(page).to have_text subgroup_user.name
+      expect(page).to have_text invited_to_project_group_user.name
+      expect(page).not_to have_text subsubgroup_user.name
+      expect(page).not_to have_text invited_to_group_group_user.name
+    end
+  end
 end