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Due some problems with GTK L&F we are providing our own tree expanded/collapsed icons and these are not painted properly. The original problem is described in bug 42942 I guess we should not override default in core/plaf and better handle this case in property sheet and do the tricks with custom icon only here.
Checking in GtkLFCustoms.java; /shared/data/ccvs/repository/core/swing/plaf/src/org/netbeans/swing/plaf/gtk/GtkLFCustoms.java,v <-- GtkLFCustoms.java new revision: 1.14; previous revision: 1.13 http://openide.netbeans.org/source/browse/openide/explorer/src/org/openide/explorer/propertysheet/PropUtils.java?r1=1.9&r2=1.10