src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2011, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 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

@@ -230,10 +230,11 @@
     private volatile boolean isFullScreenMode;
     private boolean isFullScreenAnimationOn;
 
     private volatile boolean isInFullScreen;
     private volatile boolean isIconifyAnimationActive;
+    private volatile boolean isZoomed;
 
     private Window target;
     private LWWindowPeer peer;
     protected CPlatformView contentView;
     protected CPlatformWindow owner;

@@ -504,11 +505,11 @@
         nativeSetNSWindowStandardFrame(getNSWindowPtr(), x, y, w, h);
     }
 
     private boolean isMaximized() {
         return undecorated ? this.normalBounds != null
-                : CWrapper.NSWindow.isZoomed(getNSWindowPtr());
+                : isZoomed;
     }
 
     private void maximize() {
         if (peer == null || isMaximized()) {
             return;

@@ -972,10 +973,11 @@
         responder.handleWindowFocusEvent(gained, oppositePeer);
     }
 
     protected void deliverMoveResizeEvent(int x, int y, int width, int height,
                                         boolean byUser) {
+        isZoomed = CWrapper.NSWindow.isZoomed(getNSWindowPtr());
         checkZoom();
 
         final Rectangle oldB = nativeBounds;
         nativeBounds = new Rectangle(x, y, width, height);
         if (peer != null) {