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When switching project groups, library sources of the projects being closed remain open in the editor (unlike the project sources), although the project group being switched to doesn't have references to those libraries.
Not language specific, handled by generic projectui module ProjectUtilities.OpenCloseProjectDocument.doClose
The project close closes just project sources not sources opened by --open or sources of dependent artifacts. Probably enhancement or WONTFIX.
Yes, only project sources are closed and reopened when projects themselves are closed and reopened. *** This bug has been marked as a duplicate of bug 168578 ***