Regression: JProgressBar component is not visible when using GTK L&F style on Solaris and Linux

JProgressBar swing component is not visible (is not drawn) when using GTK L&F style. Run attached demo program to simulate the broken behaviour. See attached picture b52.png/b53.png to see behaviour while running on b52/b53. This bug can be seen on Solaris10 32bit as well as on RHAS4.0 32bit.

Regression: YES (b53)
Package: J2SE
bundles tested:
jdk-6_0-ea-bin-b53-linux-i586-22_sep_2005.bin
jdk-6_0-ea-bin-b53-solaris-i586-22_sep_2005.sh
Version:
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b53)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b53, mixed mode, sharing)
Locale: C, de_DE.UTF-8

Platform:
OS: Solaris 10UR1
HW: Dell, P4, 512MB
bash-3.00$ uname -a
SunOS hodonin 5.10 Generic_118844-18 i86pc i386 i86pc
bash-3.00$ cat /etc/release
                        Solaris 10 10/05 s10x_u1wos_14 X86
           Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
                        Use is subject to license terms.
                           Assembled 07 September 2005
bash-3.00$ isalist
pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86

OS: RHAS4.0 32Bit
HW: Sun W1101z
Display adapter: nVidia Corporation|NV34GL [Quatro FX 500]
Window Manager: Gnome
[tester@ptakopysk java]$ uname -a
Linux ptakopysk.czech.sun.com 2.6.9-5.EL #1 Wed Jan 5 19:22:18 EST 2005 i686 athlon i386 GNU/Linux
[tester@ptakopysk java]$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 5
model name : AMD Opteron(tm) Processor 150
stepping : 10
cpu MHz : 2394.061
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm 3dnowext 3dnow
bogomips : 4702.20