hg: jdk9/client/jdk: 8134828: Scrollbar thumb disappears with Nimbus L&F

[semyon.sadetsky at oracle.com]

Changeset: b14984244f11
Author:    ssadetsky
Date:      2015-10-29 18:43 +0300
URL:       http://hg.openjdk.java.net/jdk9/client/jdk/rev/b14984244f11

8134828: Scrollbar thumb disappears with Nimbus L&F
Reviewed-by: alexsch, alexp

! src/java.desktop/share/classes/javax/swing/plaf/nimbus/AbstractRegionPainter.java
! src/java.desktop/share/classes/javax/swing/plaf/nimbus/skin.laf
! src/java.desktop/share/classes/javax/swing/plaf/synth/SynthProgressBarUI.java
+ test/javax/swing/plaf/nimbus/8041642/ScrollBarThumbVisibleTest.java