--- a/jdk/src/share/classes/javax/swing/SwingUtilities.java	Wed Mar 07 17:57:12 2012 +0400
+++ b/jdk/src/share/classes/javax/swing/SwingUtilities.java	Wed Mar 07 20:07:18 2012 +0200
@@ -792,7 +792,8 @@
      * @return true if the left mouse button was active
      */
     public static boolean isLeftMouseButton(MouseEvent anEvent) {
-         return (anEvent.getButton() == MouseEvent.BUTTON1);
+         return ((anEvent.getModifiersEx() & InputEvent.BUTTON1_DOWN_MASK) != 0 ||
+                 anEvent.getButton() == MouseEvent.BUTTON1);
     }
 
     /**
@@ -802,7 +803,8 @@
      * @return true if the middle mouse button was active
      */
     public static boolean isMiddleMouseButton(MouseEvent anEvent) {
-        return (anEvent.getButton() == MouseEvent.BUTTON2);
+        return ((anEvent.getModifiersEx() & InputEvent.BUTTON2_DOWN_MASK) != 0 ||
+                anEvent.getButton() == MouseEvent.BUTTON2);
     }
 
     /**
@@ -812,7 +814,8 @@
      * @return true if the right mouse button was active
      */
     public static boolean isRightMouseButton(MouseEvent anEvent) {
-        return (anEvent.getButton() == MouseEvent.BUTTON3);
+        return ((anEvent.getModifiersEx() & InputEvent.BUTTON3_DOWN_MASK) != 0 ||
+                anEvent.getButton() == MouseEvent.BUTTON3);
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/SwingUtilities/7146377/bug7146377.java	Wed Mar 07 20:07:18 2012 +0200
@@ -0,0 +1,201 @@
+/*
+ * Copyright (c) 2012, 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 7146377
+   @summary closed/javax/swing/DataTransfer/4876520/bug4876520.java failed since b08 in jdk 8
+   @author Pavel Porvatov
+*/
+
+import sun.awt.SunToolkit;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.InputEvent;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+
+public class bug7146377 {
+    private static JLabel label;
+    private static JFrame frame;
+
+    private static volatile Point point;
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                frame = new JFrame();
+
+                label = new JLabel("A label");
+
+                label.addMouseListener(new MouseListener() {
+                    @Override
+                    public void mouseClicked(MouseEvent e) {
+                        checkEvent(e);
+                    }
+
+                    @Override
+                    public void mousePressed(MouseEvent e) {
+                        checkEvent(e);
+                    }
+
+                    @Override
+                    public void mouseReleased(MouseEvent e) {
+                        checkEvent(e);
+                    }
+
+                    @Override
+                    public void mouseEntered(MouseEvent e) {
+                        checkEvent(e);
+                    }
+
+                    @Override
+                    public void mouseExited(MouseEvent e) {
+                        checkEvent(e);
+                    }
+                });
+
+                frame.add(label);
+                frame.setSize(200, 100);
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                frame.setVisible(true);
+            }
+        });
+
+        SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
+
+        toolkit.realSync();
+
+        // On Linux platforms realSync doesn't guaranties setSize completion
+        Thread.sleep(1000);
+
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                point = label.getLocationOnScreen();
+            }
+        });
+
+        Robot robot = new Robot();
+
+        robot.setAutoDelay(200);
+
+        // Move mouse
+        for (int i = 0; i < 20; i++) {
+            robot.mouseMove(point.x + i, point.y + i);
+        }
+
+        for (int button : new int[]{InputEvent.BUTTON1_MASK, InputEvent.BUTTON2_MASK, InputEvent.BUTTON3_MASK}) {
+            robot.mouseMove(point.x, point.y);
+
+            // Mouse Drag
+            robot.mousePress(button);
+
+            for (int i = 0; i < 20; i++) {
+                robot.mouseMove(point.x + i, point.y + i);
+            }
+
+            robot.mouseRelease(button);
+        }
+
+        toolkit.realSync();
+
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                frame.dispose();
+            }
+        });
+
+        System.out.println("Test passed");
+    }
+
+    private static void checkEvent(MouseEvent e) {
+        String eventAsStr = eventToString(e);
+
+        System.out.println("Checking event " + eventAsStr);
+
+        check("isLeftMouseButton", SwingUtilities.isLeftMouseButton(e), oldIsLeftMouseButton(e), eventAsStr);
+        check("isRightMouseButton", SwingUtilities.isRightMouseButton(e), oldIsRightMouseButton(e), eventAsStr);
+        check("isMiddleMouseButton", SwingUtilities.isMiddleMouseButton(e), oldIsMiddleMouseButton(e), eventAsStr);
+    }
+
+    private static void check(String methodName, boolean newValue, boolean oldValue, String eventAsStr) {
+        if (newValue != oldValue) {
+            throw new RuntimeException("Regression on " + methodName + ", newValue = " + newValue +
+                    ", oldValue = " + oldValue + ", e = " + eventAsStr);
+        }
+    }
+
+    private static String eventToString(MouseEvent e) {
+        StringBuilder result = new StringBuilder();
+
+        switch (e.getID()) {
+            case MouseEvent.MOUSE_PRESSED:
+                result.append("MOUSE_PRESSED");
+                break;
+            case MouseEvent.MOUSE_RELEASED:
+                result.append("MOUSE_RELEASED");
+                break;
+            case MouseEvent.MOUSE_CLICKED:
+                result.append("MOUSE_CLICKED");
+                break;
+            case MouseEvent.MOUSE_ENTERED:
+                result.append("MOUSE_ENTERED");
+                break;
+            case MouseEvent.MOUSE_EXITED:
+                result.append("MOUSE_EXITED");
+                break;
+            case MouseEvent.MOUSE_MOVED:
+                result.append("MOUSE_MOVED");
+                break;
+            case MouseEvent.MOUSE_DRAGGED:
+                result.append("MOUSE_DRAGGED");
+                break;
+            case MouseEvent.MOUSE_WHEEL:
+                result.append("MOUSE_WHEEL");
+                break;
+            default:
+                result.append("unknown type");
+        }
+
+        result.append(", modifiers = " + MouseEvent.getMouseModifiersText(e.getModifiers()));
+        result.append(", modifiersEx = " + MouseEvent.getMouseModifiersText(e.getModifiersEx()));
+        result.append(", button = " + e.getButton());
+
+        return result.toString();
+    }
+
+    // Original implementation of SwingUtilities.isLeftMouseButton
+    private static boolean oldIsLeftMouseButton(MouseEvent e) {
+        return ((e.getModifiers() & InputEvent.BUTTON1_MASK) != 0);
+    }
+
+    // Original implementation of SwingUtilities.isMiddleMouseButton
+    private static boolean oldIsMiddleMouseButton(MouseEvent e) {
+        return ((e.getModifiers() & InputEvent.BUTTON2_MASK) == InputEvent.BUTTON2_MASK);
+    }
+
+    // Original implementation of SwingUtilities.isRightMouseButton
+    private static boolean oldIsRightMouseButton(MouseEvent e) {
+        return ((e.getModifiers() & InputEvent.BUTTON3_MASK) == InputEvent.BUTTON3_MASK);
+    }
+}