How do I add a gap between threads?

Hello,

How do I add a gap between threads?



In fact, I don't use nodes but latest messages instead.
The goal is adding a gap between threads.

I spent a few hours for trying to find the class but without success. :/

Thx for your help...

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source https://xfworld.net/threads/how-do-i-add-a-gap-between-threads.47649/