Github user emilianbold commented on the issue:
https://github.com/apache/jmeter/pull/300
> Maybe we could change how dirty check works which I think was here
because there was no Redo/Undo Management.
See the latest commit which patches CheckDirty to be undo aware.
We could change how dirty works but at this moment I'd rather use the
existing mechanisms. We can replace them with something simpler in a separate
fix.
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