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The getValue method of the AlwaysEnabledAction class returns an Image in case of the specified iconBase is a String or URL instance. But this method should return always an Icon instance (e.g. ImageIcon) for the Action.SMALL_ICON property. See also the Javadoc of the Java Action interface.
I think this will be an easy fix.
core-main#d66c2f65916f
Integrated into 'main-golden', will be available in build *200903191401* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main/rev/d66c2f65916f User: Jaroslav Tulach <jtulach@netbeans.org> Log: #160351: Always return Icon for Action.SMALL_ICON key