Github user pmouawad commented on the issue:
https://github.com/apache/jmeter/pull/300
Create a Tree like this:
Test Plan
|-------------User Defined Variable
|-------------Thread Group 1
|----------TC1
|-------------Thread Group 2
|----------TC2
Expand Thread Group 1 and Unexpand Thread Group 2.
Clone User Defined Variable
Undo
You end up with both Thread Groups expanded
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