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Typically an open project is associated with a number of so called artificial libraries that contain the model of headers that are used in this project, though themselves do not belong to any of the open projects. The content of this required artificial projects list is updated dynamically: as soon as the #include directive is resolved, necessary artificial project is added to the list (if it isn't yet opened). But the removal of the projects from this list isn't done properly. It should be done when the code model is in a stable state, taking into account file header dependency graph.
Eventually such projects are closed (when the last open project is closed). So I leave it P3.
This bug was reported against NetBeans IDE 6.0 or an older release, or against a non-maintained module. NetBeans team does not have enough resources to get to this issue, therefore we are closing the issue as a WONTFIX. If you are interested in providing a patch for this bug, please see our NetFIX guidelines for how to proceed. We apologize for any inconvenience. Thank you. The NetBeans Team