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When looking for Subtypes, Supertypes, Usages etc, often, the classes found are test classes. It would be very useful for these search results (and also in the Hierarchy window) if the test classes were visually different - e.g. different icon, or italics, or such. Thanks for considering.
Probably some icon annotation if there is a place for it. In the project's view there unfortunately no such a place but in search, hierarchy view there is.
Related to https://netbeans.org/bugzilla/show_bug.cgi?id=249928