hg: openjfx/8u-dev/rt: 8189280: Memory leak in SwingNode if Stage is not shown

[prasanta.sadhukhan at oracle.com]

Changeset: 1559d46c2e8f
Author:    psadhukhan
Date:      2017-12-12 11:06 +0530
URL:       http://hg.openjdk.java.net/openjfx/8u-dev/rt/rev/1559d46c2e8f

8189280: Memory leak in SwingNode if Stage is not shown
Reviewed-by: kcr

+ modules/swing/src/main/java/com/sun/javafx/embed/swing/Disposer.java
+ modules/swing/src/main/java/com/sun/javafx/embed/swing/DisposerRecord.java
! modules/swing/src/main/java/javafx/embed/swing/SwingNode.java
+ tests/system/src/test/java/test/javafx/embed/swing/SwingNodeMemoryLeakTest.java