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be921b067e
The main new interfaces are: - TreeDomainModel - background model interface; - TreeViewModel - flow-based view model; - TreeSwingModel - Swing compatibility layer. Auxiliary classes: - SuspendingTreeVisitor - suspending TreeVisitor equivalent; - LoadingNode - converted to Kotlin and retrofitted to implement TreeViewModel. New presentation rendering is implemented in NodeRenderer. TreeUtil.getUserObject() adapted to unwrap TreeNodeViewModel instances, as at this point they don't extend DefaultMutableTreeNode. It just doesn't seem necessary, as Swing models technically don't require it. In a similar fashion, CachedTreePresentation.getCachedNode adapted to unwrap nodes as necessary, as the new implementation forces nodes to be TreeNodeViewModel instances. AbstractTreeNodeVisitor modified to call TreeUtil.getLastUserObject instead of trying to unwrap the node itself. This lets us reuse the new getLastUserObject implementation without duplicating logic. The new implementation isn't used anywhere yet, so this commit alone shouldn't affect anything. GitOrigin-RevId: 8427b6642ff1902b3b71104c3611388e1270a5e4