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In the review for bug #229877, Simon said: >The one thing I'm still a bit concerned about is that we're >treating roots like singletons. That's a separate issue/bug though as your >patch resolves this one. The plan analysis conducted in InstallAction, which assumes upgrades and downgrades is what raised Simon's concerns, but there may be other places where we inadvertantly make this assumption in the UI. In the future we likely want to make sure that these assumptions are kept in plan validator objects or at least in the SDK classes, not the base UI support classes. This also may have an impact on the API.
Marking dup, but I'll move the comment as it provides context. *** This bug has been marked as a duplicate of bug 230878 ***