src/java.desktop/share/classes/javax/swing/DefaultDesktopManager.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2017, 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.  Oracle designates this

@@ -21,20 +21,26 @@
  * 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.
  */
 
-
 package javax.swing;
 
-import com.sun.awt.AWTUtilities;
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Container;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Toolkit;
+import java.awt.Window;
+import java.beans.PropertyVetoException;
+
 import sun.awt.AWTAccessor;
 import sun.awt.SunToolkit;
 
-import java.awt.*;
-import java.beans.PropertyVetoException;
-
 /** This is an implementation of the <code>DesktopManager</code>.
   * It currently implements the basic behaviors for managing
   * <code>JInternalFrame</code>s in an arbitrary parent.
   * <code>JInternalFrame</code>s that are not children of a
   * <code>JDesktop</code> will use this component

@@ -313,11 +319,11 @@
         Container parent = f.getParent();
         dragMode = DEFAULT_DRAG_MODE;
         if (p != null) {
             String mode = (String)p.getClientProperty("JDesktopPane.dragMode");
             Window window = SwingUtilities.getWindowAncestor(f);
-            if (window != null && !AWTUtilities.isWindowOpaque(window)) {
+            if (window != null && !window.isOpaque()) {
                 dragMode = DEFAULT_DRAG_MODE;
             } else if (mode != null && mode.equals("outline")) {
                 dragMode = OUTLINE_DRAG_MODE;
             } else if (mode != null && mode.equals("faster")
                     && f instanceof JInternalFrame