SwingSet2: Adjacent tabs are merging in JTabbedPane demo with GTK Look and Feel.

Bug Info:
========
Adjacent tabs are merging in JTabbedPane demo with GTK Look and Feel.

JDK Info:
=========
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b44)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b44, mixed mode)

Steps to Reproduce:
===================
1. Enter the following command in the console.

 ${JAVA_HOME}/bin/java -jar ../demo/jfc/SwingSet2/*.jar

2. Click on JTabbedPane demo Icon.

3. Select GTK Look and Feel option in Look and Feel menu.

4. Click on Left Radio button option.

5. Randomly click on tabs.

Expected Results:
=================
Adjacent tabs should not merge.

Actual Results:
===============
Adjacent tabs are merging.


Please check the attached images.