Where does that “Cancel reply” link come from? By using this filter, will someone no longer be able to cancel their reply? Or will that functionality still be there?
As previously mentioned. It’s WordPress default. Even the default themes have it. https://github.com/WordPress/WordPress/blob/270f2011f8ec7265c3f4ddce39c77ef5b496ed1c/wp-includes/comment-template.php#L1898
By using this filter, will someone no longer be able to cancel their reply? Or will that functionality still be there?
To be honest, I’m not even sure why WordPress keeps it. It’s set to “display: none;” by default so basically, it’s not even showing on the site for interactive purposes.
And users can always simply refresh the page if they don’t wish to push through with the comment, this effective “cancels” the reply.