I have some custom CSS that puts a box around each category, but even with this disabled, the X or close button in the top right corner of chat windows does not show up. Edit: Looks like it only does it with the Flatly theme. If I go into my settings on this site and select Flatly, it does it here as well.
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@whimpers If you get the entire message object it should have a fromuid field, using that id you can get the user object at user:<uid> everyone in the room receives the message, you can get the users in the room from chat:room:<roomId>:uids