Fix handling of edited status with new media and no text (#35970)

app/services/activitypub/process_status_update_service.rb

@@ -112,6 +112,8 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
     @status.ordered_media_attachment_ids = @next_media_attachments.map(&:id)
 
     @media_attachments_changed = true if @status.ordered_media_attachment_ids != previous_media_attachments_ids
+
+    @status.media_attachments.reload if @media_attachments_changed
   end
 
   def download_media_files!

spec/services/activitypub/process_status_update_service_spec.rb

@@ -343,6 +343,42 @@ RSpec.describe ActivityPub::ProcessStatusUpdateService do
       end
     end
 
+    context 'when originally without media attachments and text is removed' do
+      before do
+        stub_request(:get, 'https://example.com/foo.png').to_return(body: attachment_fixture('emojo.png'))
+      end
+
+      let(:payload) do
+        {
+          '@context': 'https://www.w3.org/ns/activitystreams',
+          id: 'foo',
+          type: 'Note',
+          content: '',
+          updated: '2021-09-08T22:39:25Z',
+          attachment: [
+            { type: 'Image', mediaType: 'image/png', url: 'https://example.com/foo.png' },
+          ],
+        }
+      end
+
+      it 'updates media attachments, fetches attachment, records media and text removal in edit' do
+        subject.call(status, json, json)
+
+        expect(status.reload.ordered_media_attachments.first)
+          .to be_present
+          .and(have_attributes(remote_url: 'https://example.com/foo.png'))
+
+        expect(a_request(:get, 'https://example.com/foo.png'))
+          .to have_been_made
+
+        expect(status.edits.reload.last.ordered_media_attachment_ids)
+          .to_not be_empty
+
+        expect(status.edits.reload.last.text)
+          .to_not be_present
+      end
+    end
+
     context 'when originally with media attachments' do
       let(:media_attachments) { [Fabricate(:media_attachment, remote_url: 'https://example.com/foo.png'), Fabricate(:media_attachment, remote_url: 'https://example.com/unused.png')] }