7036733: Regression : NullPointerException when scrolling horizontally on AWT List

Reviewed-by: dcherepanov

src/solaris/classes/sun/awt/X11/XListPeer.java

@@ -1479,16 +1479,19 @@ class XListPeer extends XComponentPeer implements ListPeer, XScrollbarClient {
         int h = height - (SCROLLBAR_AREA + (2 * MARGIN));
         hsb.setValue(hsb.getValue() + x);
 
+        int options = PAINT_ITEMS | PAINT_HSCROLL;
+
         Rectangle source = null;
         Point distance = null;
         if (x < 0) {
             source = new Rectangle(MARGIN + SPACE, MARGIN, w + x, h);
             distance = new Point(-x, 0);
+            options |= COPY_AREA;
         } else if (x > 0) {
             source = new Rectangle(MARGIN + SPACE + x, MARGIN, w - x, h);
             distance = new Point(-x, 0);
+            options |= COPY_AREA;
         }
-        int options = COPY_AREA | PAINT_ITEMS | PAINT_HSCROLL;
         repaint(vsb.getValue(), lastItemDisplayed(), options, source, distance);
     }
 

test/java/awt/List/ScrollOutside/ScrollOut.java

+/*
+ * Copyright (c) 2011 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+  @test
+  @bug 7036733
+  @summary Regression : NullPointerException when scrolling horizontally on AWT List
+  @author Andrei Dmitriev area=awt-list
+  @library ../../regtesthelpers
+  @build Util
+  @run main ScrollOut
+*/
+
+import java.awt.*;
+import java.awt.event.*;
+import sun.awt.SunToolkit;
+import test.java.awt.regtesthelpers.Util;
+
+public class ScrollOut
+{
+    public static final void main(String args[])
+    {
+        final Frame frame = new Frame();
+        final List list = new List();
+        Robot robot = null;
+
+        for (int i = 0; i < 5; i++){
+            list.add("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
+        }
+
+        frame.add(list);
+
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+
+        try{
+            robot = new Robot();
+        }catch(AWTException e){
+            throw new RuntimeException(e);
+        }
+
+        //Drag from center to the outside on left
+        Point from = new Point(list.getLocationOnScreen().x + list.getWidth()/2,
+                               list.getLocationOnScreen().y + list.getHeight()/2);
+        Point to = new Point(list.getLocationOnScreen().x - 30,
+                             from.y);
+
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+        Util.drag(robot, from, to, InputEvent.BUTTON1_MASK);
+
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+
+        //Drag from center to the outside on up
+        to = new Point(from.x,
+                       list.getLocationOnScreen().y - 50);
+
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+        Util.drag(robot, from, to, InputEvent.BUTTON1_MASK);
+
+    }//End  init()
+}