I opened a bug on the github:
https://github.com/paul999/mention/issues/40
Basically if I try to tag someone but end up not really tagging them, ending up with only the text
@username
(and not [mention]username[/mention]
) whenever someone quotes that post then a dropdown with the username will always be visible and will follow the cursor position as if to finish tagging the user on the quoted post.I provided more details and screenshots on the github issue.
Thanks.