To the best of my knowledge and experience, you are able to paste or directly type or intermingle the two, as you please. I have pasted many times. Such as now...
Does that filter not like pasted text? Am I required to hand-type everything here?
However, specific modes of pasting within Windows CAN include hidden items or hidden characters. The Win pasteboard is not very bright about what it takes in. If you have Notepad, pasting something into an empty Notepad file will reveal invisible or non-standard characters.
Researching this a bit, I noted that there can be a XenForo "buggered" interaction with your browser, so let's ask the question: What browser do you use and is it up to date? What anti-virus do you use?
Dave's suggestion about this string:
LDAP://dc=yourdomain, dc=com
doesn't seem to be significant because when I bring it in, within quotes or not, it doesn't get highlighted like a web reference. The quotes shield it from further processing, but even as-is without quotes, I can see no effect. As a moderator, I could see what it would do if something was special about that string but when evaluating it, that string does nothing. So Dave, nice try but by experiment it doesn't seem to matter.