Reuse token-free message controls and render posting deliveries once

test/controllers/fragment_cache_test.rb

@@ -63,6 +63,17 @@ class FragmentRenderingTest < ActionDispatch::IntegrationTest
     assert_includes response.body, "foreign conditional body"
   end
 
+  test "message controls survive creator edits while the author is rendered fresh" do
+    get room_messages_url(@room)
+    assert_response :success
+    foreign_write("UPDATE users SET name = ? WHERE id = ?", "Fresh creator with cached controls", @message.creator_id)
+    ActionView::Base.any_instance.expects(:form_with).never
+    get room_messages_url(@room)
+    assert_response :success
+    assert_includes response.body, "Fresh creator with cached controls"
+    assert_select "form[action=?]", message_boosts_path(@message)
+  end
+
   test "a foreign commit after capture bypasses old native fragment lookups" do
     ResponseCache.instance.stubs(:budget).returns(0)
     get room_messages_url(@room)