There is a funny behaviour in the text processor whereby two dots e.g.
cause it to display successively edited versions of your post!
It is obvious when it happens but some people submit a post and don’t look at it afterwards.
Best to use three dots in that case
Not so.. ??
That sounds like it might open the door to a mild version on this: https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)
Only to posts you made yourself, it seems.