Regression test fails: test/closed/javax/swing/JComboBox/6428549/bug6428549.java

JDK: 7 b22
Tested OSes:
- Solaris nevada b70: test fails
- Linux i686: test fails
- Windows XP: test passes

Stack trace:
java.lang.RuntimeException: JComboBox doesn't properly handle the ENTER key pressing for popup item selection.
at SwingTestHelper.fail(SwingTestHelper.java:691)
at bug6428549.onBackgroundThread30(bug6428549.java:139)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:623)
at SwingTestHelper.invoke(SwingTestHelper.java:625)
at SwingTestHelper.controlLoop(SwingTestHelper.java:571)
at SwingTestHelper.access$700(SwingTestHelper.java:173)
at SwingTestHelper$4.run(SwingTestHelper.java:497)
at java.lang.Thread.run(Thread.java:675)

The test logs in the attachment.