Keep native control renders responsive (#3306)

* Keep native control renders responsive

* Refresh replies for immediately completed render jobs

* #3289: Bind waiting replies to their native render

crates/engine/src/cmd/render_queue.rs

@@ -734,7 +734,11 @@ fn stop(s: &mut Session, _: &Value) -> Result<Value> {
 }
 
 fn list(s: &mut Session, _: &Value) -> Result<Value> {
-    s.poll_render();
+    // The suspended script's frontend applies post-render edits before resuming it. A
+    // control inspection must not apply those edits while the undo-group guard is active.
+    if s.script_ui.render_host.is_none() {
+        s.poll_render();
+    }
     let items: Vec<Value> = s.project.render_queue.iter().enumerate().map(|(k, i)| item_json(s, i, k)).collect();
     Ok(json!({"items": items, "rendering": s.is_rendering(), "progress": s.render_progress()}))
 }