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DocumentModel is core to XML navigators and code folding in XML documents. Historically, there has been a lot of issues w.r.t. performance and memory. Also there were few deadlocks. So for 6.1 I want to revisit DocumentModel and its architechture. We'll rewrite if we have to.
Since 6.5, Folds no longer use DocumentModel. So the only remaining client is Navigator. Since there is a plan to rewrite navigator, I'll mark it as a duplicate. See issue 126968. *** This issue has been marked as a duplicate of 126968 ***