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I would be very useful if package-private classes (or rather: source files whose top-level classes are package-private) had a different icon, similar to how main classes (classes with a main() method) have a different icon. This way one could quickly see in the Files/Projects treeviews which classes constitute the public API of a package and which classes are just implementation classes. I suppose that his is easy to implement, in analogy to the existing functionality for main classes. If necessary I can help designing an icon.