Recreates the label priorities when moving project to another group

app/services/labels/transfer_service.rb

@@ -14,7 +14,7 @@ module Labels
       return unless group.present?
 
       Label.transaction do
-        labels_to_transfer = Label.where(id: label_links.select(:label_id).uniq)
+        labels_to_transfer = Label.where(id: label_links.select(:label_id))
 
         labels_to_transfer.find_each do |label|
           new_label_id = find_or_create_label!(label)
@@ -22,6 +22,7 @@ module Labels
           next if new_label_id == label.id
 
           LabelLink.where(label_id: label.id).update_all(label_id: new_label_id)
+          LabelPriority.where(project_id: project.id, label_id: label.id).update_all(label_id: new_label_id)
         end
       end
     end

spec/services/labels/transfer_service_spec.rb

@@ -26,6 +26,16 @@ describe Labels::TransferService, services: true do
       expect { service.execute }.to change(project.labels, :count).by(2)
     end
 
+    it 'recreates label priorities related to the missing group labels' do
+      create(:label_priority, project: project, label: group_label_1, priority: 1)
+
+      service.execute
+
+      new_project_label = project.labels.find_by(title: group_label_1.title)
+      expect(new_project_label.id).not_to eq group_label_1.id
+      expect(new_project_label.priorities).not_to be_empty
+    end
+
     it 'does not recreate missing group labels that are not applied to issues or merge requests' do
       service.execute