8202790: DnD test DisposeFrameOnDragTest.java does not clean up

Backport-of: 102a305f73d52d8e378de46c3c0b170db0f2c8af

Author: Amos Shi

test/jdk/ProblemList.txt

@@ -446,7 +446,6 @@ java/awt/JAWT/JAWT.sh 8197798 windows-all
 java/awt/Debug/DumpOnKey/DumpOnKey.java 8202667 windows-all
 java/awt/Focus/WindowUpdateFocusabilityTest/WindowUpdateFocusabilityTest.java 8202926 linux-all
 java/awt/datatransfer/ConstructFlavoredObjectTest/ConstructFlavoredObjectTest.java 8202860 linux-all
-java/awt/dnd/DisposeFrameOnDragCrash/DisposeFrameOnDragTest.java 8202790 macosx-all,linux-all
 java/awt/FileDialog/FilenameFilterTest/FilenameFilterTest.java 8202882 linux-all
 java/awt/Frame/FramesGC/FramesGC.java 8079069 macosx-all
 java/awt/Focus/NonFocusableBlockedOwnerTest/NonFocusableBlockedOwnerTest.java 7124275 macosx-all

test/jdk/java/awt/dnd/DisposeFrameOnDragCrash/DisposeFrameOnDragTest.java

@@ -49,6 +49,7 @@
 public class DisposeFrameOnDragTest {
 
     private static JTextArea textArea;
+    private static JFrame background;
 
     public static void main(String[] args) throws Throwable {
 
@@ -72,14 +73,20 @@ public void run() {
         Util.drag(testRobot,
                 new Point((int) loc.x + 3, (int) loc.y + 3),
                 new Point((int) loc.x + 40, (int) loc.y + 40),
-                InputEvent.BUTTON1_MASK);
+                InputEvent.BUTTON1_DOWN_MASK);
 
         Util.waitForIdle(testRobot);
 
         testRobot.delay(200);
+        background.dispose();
     }
 
     private static void constructTestUI() {
+        background = new JFrame("Background");
+        background.setBounds(100, 100, 100, 100);
+        background.setUndecorated(true);
+        background.setVisible(true);
+
         final JFrame frame = new JFrame("Test frame");
         textArea = new JTextArea("Drag Me!");
         try {