hg: openjfx/jfx-dev/rt: 8217492: JavaFX - memory leak after the event WindowEvent.DESTROY

[kevin.rushforth at oracle.com]

Changeset: b1f419c89b0a
Author:    kcr
Date:      2019-02-27 10:18 -0800
URL:       http://hg.openjdk.java.net/openjfx/jfx-dev/rt/rev/b1f419c89b0a

8217492: JavaFX - memory leak after the event WindowEvent.DESTROY
Summary: WindowStage, cleanup platformWindows on setPlatformWindowClosed
Reviewed-by: kcr
Contributed-by: fk at sandec.de

! modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/WindowStage.java