Github user emilianbold commented on the issue:
https://github.com/apache/jmeter/pull/300
> a 900 KB plan
Could you email me such a plan to see how slow it is?
> You end up with Thread Group 2 expanded and Thread Group 1 unexpanded.
>TreeState#restore() seems to be lost in indexes.
The commit 'TreeState is part of the undoable edit' fixes this. Doesn't
really make sense to restore the tree state on another tree.
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