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I think it is due to changes made by Trung (I think) which force to use MetalLF chooser when GTK is in use. But it makes quickfilechooser "disabled".
For some reason, in org.netbeans.core.startup.Main, initUICustomizations() is called after getModuleSystem(), which I presume is the reason. (If you install the quickfilechooser NBM under GTK, it works fine until you restart the IDE.) I can try to listen for changes and restore the right filechooser UI.
Yup, using a listener works.
Thanks, I can switch back again :), v/c