Disabled slider only get partially repainted, and is somehow depending on the position of marker of another slider on the left.

[ Quoting Alex Lam S.L. ###@###.### ]

I've found out the steps to reproduce the problem, also that the
problem exists for Java 5 u6

1) start with NapkinLAF
2) switch to any LAF
3) switch back to Napkin
4) now drag the slider

Alex.