--- old/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2017-10-29 18:24:34.000000000 +0530
+++ new/src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformWindow.java	2017-10-29 18:24:34.000000000 +0530
@@ -1074,6 +1074,13 @@
         }
     }
 
+    /* Do toggle full screen upon double click
+     * on non-client area(i.e., title bar)
+     */
+    private void deliverNCDblClick() {
+        execute(this::_toggleFullScreenMode);
+    }
+
     /*
      * Our focus model is synthetic and only non-simple window
      * may become natively focusable window.