Merge branch 'siemens/gitlab-ce-fix/subgroup-hide-button' into 'master'

Hide new subgroup button if user has no permission to create one

Closes #30139

See merge request !10627

app/policies/group_policy.rb

@@ -28,6 +28,7 @@ class GroupPolicy < BasePolicy
       can! :admin_namespace
       can! :admin_group_member
       can! :change_visibility_level
+      can! :create_subgroup if @user.can_create_group
     end
     if globally_viewable && @subject.request_access_enabled && !member

app/views/groups/subgroups.html.haml

@@ -9,7 +9,7 @@
     .nav-controls
       = form_tag request.path, method: :get do |f|
         = search_field_tag :filter_groups, params[:filter_groups], placeholder: 'Filter by name', class: 'form-control', spellcheck: false
-      - if can? current_user, :admin_group, @group
+      - if can?(current_user, :create_subgroup, @group)
         = link_to new_group_path(parent_id: @group.id), class: 'btn btn-new pull-right' do
           New Subgroup

changelogs/unreleased/siemens-gitlab-ce-fix-subgroup-hide-button.yml

+---
+title: Hide new subgroup button if user has no permission to create one
+merge_request: 10627
+author:

spec/policies/group_policy_spec.rb

@@ -22,7 +22,8 @@ describe GroupPolicy, models: true do
       :admin_group,
       :admin_namespace,
       :admin_group_member,
-      :change_visibility_level
+      :change_visibility_level,
+      :create_subgroup
     ]
   end