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According to result of discussion about how to represent the internal data. We came to an agreement, it is a better to use n-branch tree, which more fits to user point of view what he sees, It also corresponds to data in config files and also will be better to achieve tasks from UI spec. Binary tree which corresponds to actual JSplitPane is just an impl detail (if there is a "n-JSplitPane" component it would fit better). Note: This doesn't the structure passed to view, it will have a binary tree style, which fits for current (JSplitPane type) view.
Fixed in [winsys_29836] branch. core/../windows/model/SplitSubModel.java 1.1.2.5