The arrow button is shifted 1 to two pixel left when the Jcombobox is in right to left orientation. I have attached the screen shot of the same. This is seen in PIT builds only. 

Step to reproduce
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1) Run the attached testcase.
2) Observe that non editable Jcombobox arrow button is shifted 1 to 2 pixel towards the left side. If you see the same then the bug is reproduced.

I have noticed another issue also. 
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3) Select any item from the non-editable Jcombobox & observe that selected item goes outside the combobox. If you see the  same then the bug is reproduced.

I have also noticed another issue
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4) Observe that impression of the button is still on the right of the non -editable comobobox. only arrow have move to left side.