Sort autocomplete by latest message instead of alphabetically

[pta2002]

Lets see in this case:

There are users Albert, Alfred and Alice, and the chat log looks like this:

<Albert> [message1]
<Alice> [message2]
<Alice> [message3]

You now want to reply to Alice, so you use write "Al" and use the autocomplete, but it'll default to Albert because it's first alphabetically.

I understand this can be difficult because of network problems, but a solution would be to keep a list that stores when a nick last spoke, defaulting to alphabetical order if that isn't available.