Refactor designs route

config/routes/project.rb

@@ -500,6 +500,10 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
           get :realtime_changes
           post :create_merge_request
           get :discussions, format: :json
+
+          Gitlab.ee do
+            get 'designs(/*vueroute)', to: 'issues#show', format: false
+          end
         end
 
         collection do

ee/config/routes/project.rb

@@ -72,13 +72,6 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
         end
       end
 
-      resources :issues, only: [], constraints: { id: /\d+/ } do
-        member do
-          get :designs, action: 'show'
-          get 'designs/*vueroute', action: 'show', format: false
-        end
-      end
-
       resource :insights, only: [:show] do
         collection do
           post :query