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http://hg.netbeans.org/main/rev/0a250da0bd62 ("new default window layout") introduced a dependency from core.ide to five new modules, including the project system. This is not good. Please move the openCloseWindowGroup functionality to the projectui module where it belongs. Ditto OpenedProjects.wsgrp. Good thing I'm watching api-changes@netbeans.org...
fixed d080d127996f