tests: the pending-open control test waits for the worker by time, not by 30 frames

crates/ui-egui/tests/it/control.rs

@@ -1672,15 +1672,19 @@ fn control_open_replies_pending_while_the_worker_opens_and_focuses_once_it_has()
     assert_eq!(first["pending"], true, "{first}");
 
     // The worker completes the open on later frames; the tab shows, and only then does a
-    // repeated open focus it instead of reporting another pending open.
+    // repeated open focus it instead of reporting another pending open. The worker is a thread
+    // of its own, so the wait is bounded by time: a busy runner can draw 30 frames before it has
+    // read the file.
+    let deadline = std::time::Instant::now() + std::time::Duration::from_secs(30);
     let mut documents = 0;
-    for _ in 0..30 {
+    while std::time::Instant::now() < deadline {
         h.run_steps(1);
         let state = ok(&mut h, &c, "ui.state", json!({}));
         documents = state["documents"].as_array().map(|d| d.len()).unwrap_or_default();
         if documents == 1 {
             break;
         }
+        std::thread::sleep(std::time::Duration::from_millis(5));
     }
     assert_eq!(documents, 1, "the pending open completed into a tab");