[10] RFR JDK-8189280:Memory leak in SwingNode if Stage is not shown

[Prasanta Sadhukhan]

Hi All,

Please review a swingnode memory leak fix for fx
http://cr.openjdk.java.net/~psadhukhan/fx/8189280/webrev.00/
for issue
https://bugs.openjdk.java.net/browse/JDK-8189280

More info in JBS.

Regards
Prasanta