more stable replacement for waitForAlarm

platform/testFramework/src/com/intellij/testFramework/PlatformTestUtil.java

@@ -280,6 +280,20 @@ public class PlatformTestUtil {
     }
   }
 
+  @TestOnly
+  public static void waitFor(long duration, @NotNull TimeUnit unit) {
+    waitFor(unit.toMillis(duration));
+  }
+
+  @TestOnly
+  public static void waitFor(long millis) {
+    assert millis > 0 && EventQueue.isDispatchThread();
+    long startTimeMillis = System.currentTimeMillis();
+    while (millis > (System.currentTimeMillis() - startTimeMillis)) {
+      UIUtil.dispatchAllInvocationEvents();
+    }
+  }
+
   @TestOnly
   public static void waitForCallback(@NotNull ActionCallback callback) {
     AsyncPromise<?> promise = new AsyncPromise<>();