JSpinner components in Options/Miscellanous/VisualWeb on GTK are not according to Nimbus L&F. See the attached image.
I'm not sure which component this belongs to, please reassign if necessary.
Created attachment 59641 [details]
JSpinner component on Nimbus L&F
That must be a problem of the Nimbus L&F itself. That JSpinner component doesn't make any customization of its L&F in
the NB code. Please look for bugs regarding JSpinner and Nimbus.
Note: I think Nimbus will be only in beta in JDK 6 update 10. Please, check accordingly.