Extract #resolve_todos method

app/services/merge_requests/update_service.rb

@@ -33,9 +33,7 @@ def handle_changes(merge_request, options)
       old_reviewers = old_associations.fetch(:reviewers, [])
       changed_fields = merge_request.previous_changes.keys
-      if has_changes?(merge_request, old_labels: old_labels, old_assignees: old_assignees, old_reviewers: old_reviewers)
-        todo_service.resolve_todos_for_target(merge_request, current_user)
-      end
+      resolve_todos(merge_request, old_labels, old_assignees, old_reviewers)
       if merge_request.previous_changes.include?('title') ||
           merge_request.previous_changes.include?('description')
@@ -121,6 +119,12 @@ def notify_if_mentions_added(merge_request, old_mentioned_users)
       )
     end
+    def resolve_todos(merge_request, old_labels, old_assignees, old_reviewers)
+      return unless has_changes?(merge_request, old_labels: old_labels, old_assignees: old_assignees, old_reviewers: old_reviewers)
+
+      todo_service.resolve_todos_for_target(merge_request, current_user)
+    end
+
     def handle_target_branch_change(merge_request)
       return unless merge_request.previous_changes.include?('target_branch')