Example reply input:
<small> Text ~~~~ </small>
Expected output would be an entirely small line; reply tool forces another copy of the signature on to the end.
Perhaps signatures should never be added if the tilde magic signature text is present?
Reported on enwiki by Blaze_Wolf in https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:Talk_pages_project&oldid=1073290871#Gamma_Testers