Regression: JToolBar's separator is wrongly rendered using GTK L&F on Linux and Solaris

JToolBar's separator is wrongly rendered using GTK L&F on Linux and Solaris. When a JToolBar is docked in a horizontal position, the separator is rendered as if in a vertical position. Using Solaris10 implicit GTK L&F the separator is also wrongly positioned on the top of the JToolBar instead of being rendered in the middle of the toolbar. See attached images for detailed info.

Steps to reproduce:
Run any java program with JToolBar's separator and GTK L&F set.

Regression: Yes, the separator is rendered as vertical bar on horizontally docked JToolbar on Tiger

Versions tested:
java version "1.6.0-rc"
Java(TM) SE Runtime Environment (build 1.6.0-rc-b92)
Java HotSpot(TM) Client VM (build 1.6.0-rc-b92, mixed mode, sharing)

bundles tested:
jdk-6-rc-bin-b92-linux-amd64-20_jul_2006.bin
jdk-6-rc-bin-b92-solaris-i586-20_jul_2006.sh
jdk-6-rc-bin-b91-solaris-sparc-13_jul_2006.sh
jdk-6-rc-bin-b91-solaris-sparcv9-13_jul_2006.sh

Locale: C, de_DE.UTF-8
OS: Linux, Solaris