I am not sure if this is desirable, it seems to easy for it to do the wrong thing…

But note that you can simply type the ~~~~ at the end of the comment yourself, and it will be preserved (the tool won't add a second signature).

See also T249889: Reconsider placement of signatures to make comments more readable

In T250433#6064270, @matmarex wrote:

I am not sure if this is desirable, it seems to easy for it to do the wrong thing…

But note that you can simply type the ~~~~ at the end of the comment yourself, and it will be preserved (the tool won't add a second signature).

This is nice from my point of view.