src/java.desktop/unix/classes/sun/awt/X11/XWM.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2019, 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

@@ -547,10 +547,16 @@
                             return true;
                         }
                     } finally {
                         state_getter.dispose();
                     }
+                    XQueryTree qt = new XQueryTree(wmwin);
+                    try {
+                        if (qt.execute() > 0) return true;
+                    } finally {
+                        qt.dispose();
+                    }
                 }
             }
         } finally {
             getter.dispose();
         }