debug tests hanging in ChangeListManagerImpl.waitEverythingDoneInTestMode

platform/util/src/com/intellij/util/ui/UIUtil.java

@@ -2396,16 +2396,23 @@ public class UIUtil {
   /** @see #pump() */
   @TestOnly
   public static void dispatchAllInvocationEvents() {
-    //noinspection StatementWithEmptyBody
-    while(dispatchInvocationEvent());
+    for (int i = 1; ; i++) {
+      AWTEvent event = dispatchInvocationEvent();
+      if (event == null) break;
+
+      if (i % 10000 == 0) {
+        //noinspection UseOfSystemOutOrSystemErr
+        System.out.println("Suspiciously many (" + i + ") AWT events, last dispatched " + event);
+      }
+    }
   }
 
   @TestOnly
-  public static boolean dispatchInvocationEvent() {
+  public static AWTEvent dispatchInvocationEvent() {
     assert EdtInvocationManager.getInstance().isEventDispatchThread() : Thread.currentThread() + "; EDT: "+getEventQueueThread();
     final EventQueue eventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue();
     AWTEvent event = eventQueue.peekEvent();
-    if (event == null) return false;
+    if (event == null) return null;
     try {
       event = eventQueue.getNextEvent();
       if (event instanceof InvocationEvent) {
@@ -2418,7 +2425,7 @@ public class UIUtil {
     catch (Exception e) {
       LOG.error(e);
     }
-    return true;
+    return event;
   }
 
   private static Thread getEventQueueThread() {

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ChangeListManagerImpl.java

@@ -1716,7 +1716,11 @@ public class ChangeListManagerImpl extends ChangeListManagerEx implements Projec
 
     @TestOnly
     private void awaitAll() {
+      long start = System.currentTimeMillis();
       while (true) {
+        if (System.currentTimeMillis() - start > TimeUnit.MINUTES.toMillis(10)) {
+          throw new IllegalStateException("Too long waiting for VCS update");
+        }
         Future future;
         synchronized (myFutures) {
           future = myFutures.peek();