Table scrollbar thumb move when the user clicks in space between the table & the scrollbar.

Table scrollbar thumb move when the user clicks in space between the table & the scrollbar. This is reproducable from 1.4.2 on wards. This is in GTK look and feel.

Impace of this problem.
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I am using SwingSet2 to reproduce this problem. Till jdk 6.0 the table scrollbar is below the table header. I have attached the screen shot on jdk6table.png. But in jdk7.0 the scrollbar is equal to the table header. I have attached the screen shot on jdk7table.png. When the user clicks in between the header & scrollbar, the scrollbar thumb moves. This gives an impression for the user that table is sorting. "Actually the table is not sorted" , but the scrollbar is moving which intend rows of the table moves.

Expected :
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Clicking in space between the table & scrollbar should not move the scrollbar thumb.

Step to reproduce:
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1) Run SwingSet2.
2) Select Table demo.
3) Click on the space between the header & scrollbar as attached in the screen shot jdk7table.png. or jdk6table.png. If you observe that scrollbar thumb moves , then the bug is reproduced.