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BUG Session namespace sharing for CMS controllers
Ideally we could do this without session, but pragmatically we still need it, because of the inflexible routing system, and because of performance considerations. Example: The tree is lazy loaded via a generic URL (admin/pages/treeview). While we could add ?ID=<currentpage> to make the view (more or less) stateless, it would trigger a full tree reload on every tree navigation action. Instead, we assume that all "reachable" nodes are already cached, and simply mark a different one as current. For this to work, we need shared session state between CMS controllers. See http://open.silverstripe.org/ticket/7815 for detail.
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