Github user emilianbold commented on the issue:
https://github.com/apache/jmeter/pull/300
It's not the same bug, but a limitation of the current undo design I've
built upon.
We basically take a snapshot at the *end* of an action. The snapshot
includes the tree data and state.
>step 3. Add User Defined Variables, move it before Thread Group 1
>step 4. Unfold TG2 and fold TG1
>step 5. Duplicate User Defined Variables
So when you undo, you don't go back in time to right before step 5 in order
to see that tree state. You actually go at the end of step 3, and see the tree
state *before* step 4.
I have some ideas how step 4 might become an undoable edit itself but I'd
rather not complicate the patch too much.
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