test closed/javax/swing/Popup/TaskbarPositionTest.java still failed on linux x86 when taskbar is on top with jdk 7u6b06, jdk 8 b37; test passed with jdk7u6b05 and jdk7u6b06 when taskbar is on bottom

log:
----------System.out:(0/0)----------
----------System.err:(5/514)----------
java.lang.RuntimeException: We do not match! java.awt.Rectangle[x=0,y=25,width=1024,height=718] / java.awt.Rectangle[x=0,y=0,width=109,height=121]
        at TaskbarPositionTest.isPopupOnScreen(TaskbarPositionTest.java:264)
        at TaskbarPositionTest$RobotThread.run(TaskbarPositionTest.java:121)
        at java.lang.Thread.run(Thread.java:722)
STATUS:Failed.`main' threw exception: java.lang.RuntimeException: We do not match! java.awt.Rectangle[x=0,y=25,width=1024,height=718] / java.awt.Rectangle[x=0,y=0,width=109,height=121]
result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: We do not match! java.awt.Rectangle[x=0,y=25,width=1024,height=718] / java.awt.Rectangle[x=0,y=0,width=109,height=121]

see comments for more details