Merge branch '5561-wip-protected-branches-api-fails-if-adding-user' into 'master'

Resolve "Protected Branches API fails if adding user"

Closes #5561

See merge request gitlab-org/gitlab-ee!5238

ee/app/services/ee/protected_branches/api_service.rb

@@ -30,7 +30,7 @@ module EE
         group_ids = @merge_params.group_ids + @push_params.group_ids + @unprotect_params.group_ids # rubocop:disable Gitlab/ModuleWithInstanceVariables
         allowed_groups = @project.invited_groups.where(id: group_ids) # rubocop:disable Gitlab/ModuleWithInstanceVariables
 
-        group_ids.count == allowed_groups.count
+        group_ids.uniq.count == allowed_groups.count
       end
       # rubocop: enable CodeReuse/ActiveRecord
 
@@ -39,7 +39,7 @@ module EE
         user_ids = @merge_params.user_ids + @push_params.user_ids + @unprotect_params.user_ids # rubocop:disable Gitlab/ModuleWithInstanceVariables
         allowed_users = @project.team.users.where(id: user_ids) # rubocop:disable Gitlab/ModuleWithInstanceVariables
 
-        user_ids.count == allowed_users.count
+        user_ids.uniq.count == allowed_users.count
       end
       # rubocop: enable CodeReuse/ActiveRecord
     end