Fix /api/v1/statuses/:id/context sometimes returing Mastodon-Async-Refresh without result_count (#36779)

app/controllers/api/v1/statuses_controller.rb

@@ -66,7 +66,7 @@ class Api::V1::StatusesController < Api::BaseController
     if async_refresh.running?
       add_async_refresh_header(async_refresh)
     elsif !current_account.nil? && @status.should_fetch_replies?
-      add_async_refresh_header(AsyncRefresh.create(refresh_key))
+      add_async_refresh_header(AsyncRefresh.create(refresh_key, count_results: true))
 
       WorkerBatch.new.within do |batch|
         batch.connect(refresh_key, threshold: 1.0)

spec/requests/api/v1/statuses_spec.rb

@@ -133,6 +133,21 @@ RSpec.describe '/api/v1/statuses' do
         expect(response).to have_http_status(200)
         expect(response.content_type)
           .to start_with('application/json')
+        expect(response.headers['Mastodon-Async-Refresh']).to be_nil
+      end
+
+      context 'with a remote status' do
+        let(:status) { Fabricate(:status, account: Fabricate(:account, domain: 'example.com'), created_at: 1.hour.ago, updated_at: 1.hour.ago) }
+
+        it 'returns http success and queues discovery of new posts' do
+          expect { get "/api/v1/statuses/#{status.id}/context", headers: headers }
+            .to enqueue_sidekiq_job(ActivityPub::FetchAllRepliesWorker)
+
+          expect(response).to have_http_status(200)
+          expect(response.content_type)
+            .to start_with('application/json')
+          expect(response.headers['Mastodon-Async-Refresh']).to match(/result_count=0/)
+        end
       end
     end