8202667: java/awt/Debug/DumpOnKey/DumpOnKey.java times out on Windows

Backport-of: cd778f5b049d52b68ab5872aad5f81e86e1718f7

Author: GoeLin

test/jdk/ProblemList.txt

@@ -447,7 +447,6 @@ java/awt/font/TextLayout/LigatureCaretTest.java 8266312  generic-all
 java/awt/image/VolatileImage/CustomCompositeTest.java 8199002 windows-all,linux-all
 java/awt/image/VolatileImage/GradientPaints.java 8199003 linux-all
 java/awt/JAWT/JAWT.sh 8197798 windows-all,linux-all
-java/awt/Debug/DumpOnKey/DumpOnKey.java 8202667 windows-all
 java/awt/Focus/WindowUpdateFocusabilityTest/WindowUpdateFocusabilityTest.java 8339929 linux-all
 java/awt/datatransfer/ConstructFlavoredObjectTest/ConstructFlavoredObjectTest.java 8202860 linux-all
 java/awt/FileDialog/FilenameFilterTest/FilenameFilterTest.java 8202882 linux-all

test/jdk/java/awt/Debug/DumpOnKey/DumpOnKey.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,7 @@
  */
 
 import java.awt.AWTException;
+import java.awt.EventQueue;
 import java.awt.Frame;
 import java.awt.Robot;
 import java.awt.Window;
@@ -58,9 +59,11 @@ public void list(final PrintStream out, final int indent) {
         w.setSize(200, 200);
         w.setLocationRelativeTo(null);
         w.setVisible(true);
+        w.toFront();
+        w.requestFocus();
 
         final Robot robot = new Robot();
-        robot.setAutoDelay(50);
+        robot.setAutoDelay(100);
         robot.setAutoWaitForIdle(true);
         robot.mouseMove(w.getX() + w.getWidth() / 2,
                         w.getY() + w.getHeight() / 2);
@@ -74,7 +77,14 @@ public void list(final PrintStream out, final int indent) {
         robot.keyRelease(KeyEvent.VK_SHIFT);
         robot.keyRelease(KeyEvent.VK_CONTROL);
 
-        w.dispose();
+        try {
+            EventQueue.invokeAndWait(() -> {
+                w.dispose();
+            });
+        } catch (Exception e) {}
+
+        robot.delay(2000);
+
         if (dumped != dump) {
             throw new RuntimeException("Exp:" + dump + ", actual:" + dumped);
         }