Selecting the text in JTextField, & clicking on the other JtextField results in painting issue.

Selecting the text in JTextField, & clicking on the other JtextField results in painting issue on the first JTextField border in GTK look and feel ( CRUX theme).
Step to Reproduce :-
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1) Run the attached program.
2) Select the first textfield contents, which is having "AWT".
3) Click on the second textfield, which is having "Swing".
4) Once again click on the fist textfield. You can that selection is gone. Observe that first textfield border is not painted properly. I have attached the screen shots of the same.
You can even see a related bug 6402694.