Handle legacy sort order values

The sort orders used to be id_asc / id_desc, and are now created_asc /
created_desc. Users can still have cookies containing the old sort
orders, or bookmarks to links specifying them, so convert these to the
new versions quietly.

app/controllers/concerns/issuable_collections.rb

@@ -66,6 +66,11 @@ module IssuableCollections
     key = 'issuable_sort'
 
     cookies[key] = params[:sort] if params[:sort].present?
+
+    # id_desc and id_asc are old values for these two.
+    cookies[key] = sort_value_recently_created if cookies[key] == 'id_desc'
+    cookies[key] = sort_value_oldest_created if cookies[key] == 'id_asc'
+
     params[:sort] = cookies[key]
   end
 

spec/features/issuables/default_sort_order_spec.rb

@@ -149,6 +149,30 @@ describe 'Projects > Issuables > Default sort order', feature: true do
         expect(last_issue).to include(first_created_issuable.title)
       end
     end
+
+    context 'when the sort in the URL is id_desc' do
+      let(:issuable_type) { :issue }
+
+      before { visit_issues(project, sort: 'id_desc') }
+
+      it 'shows the sort order as last created' do
+        expect(find('.issues-other-filters')).to have_content('Last created')
+        expect(first_issue).to include(last_created_issuable.title)
+        expect(last_issue).to include(first_created_issuable.title)
+      end
+    end
+
+    context 'when the sort in the URL is id_asc' do
+      let(:issuable_type) { :issue }
+
+      before { visit_issues(project, sort: 'id_asc') }
+
+      it 'shows the sort order as oldest created' do
+        expect(find('.issues-other-filters')).to have_content('Oldest created')
+        expect(first_issue).to include(first_created_issuable.title)
+        expect(last_issue).to include(last_created_issuable.title)
+      end
+    end
   end
 
   def selected_sort_order