hg: openjfx/9-dev/rt: 8088179: [Quantum] White flashing when opening a stage with dark background

[chien.yang at oracle.com]

Changeset: bfe35c702696
Author:    ckyang
Date:      2016-11-12 09:52 -0800
URL:       http://hg.openjdk.java.net/openjfx/9-dev/rt/rev/bfe35c702696

8088179: [Quantum] White flashing when opening a stage with dark background
Reviewed-by: flar, kcr

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