If a user does add :smalltroll: to their posts and it becomes popular enough that the admin adds it to XF, which one takes precedence, the XF defintion or the user definition?
Ok. This is the behaviour.
If a user adds :thumbsup: with one image, e.g.
Then the admin adds :thumbsup: with another image
There's no error when this occurs.
All posts by that original user containing :thumbsup: will display:
All posts by any other user containing :thumbsup: will display:
So, in some ways, this is quite an elegant way of handling it. No error. But it does cause a bit of an inconsistency which isn't ideal. I cannot decide the best way of dealing with it.