Mmmm there's not many chat rooms that do this. Even the whole "show the last 10 messages" that we have is a bit extensive.
Let me rework the pm rooms first, then I'll worry about extensive history. It's just that sending a lot of messages can open up a way for people to DOS us by continuously requesting all those messages.
Increase chat archive?
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When I use the chatbox, it only shows the four most recent messages unless I keel it open, I find it pretty annoying because I'm always out of the loop when I go on it, and sometimes people respond to me without me knowing. Would it be possible to consider increasing the maximum number of displayed messages on the chat?