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For several reasons I am not willing to add restoring the expanded/collapsed state of the entire tree. The major reason is that I personally have no use for it and don't want to deal with the inevitable maintenance, complaints, change requests, and bug reports. The second reason is that performance would likely be awful.
However, I could add an option in L&F to restore the visibility of the currently focused item in the TB, which is the last item expanded, collapsed, or clicked upon. Of course, the expansion depends on the item still being there. Let me know if this is of use.
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