Color offline nicks (feature request)

[Celmor]

Describe what you'd like to see implemented, and why you think it's a good idea:

I'd like for users that left to have their nicks in existing messages in the buffer to change color to something specified, like red, to differentiate them from online users (which have a random or static different color).

Use-Case

If watching a channel for users asking questions where some of them leave before being able to respond it's useful to know that they already quit before writing a response. This makes it unnecessary to leave LEAVE messages enabled to see for oneself if that users left the channel or try to complete the user to find out if he is still in the channel.

Comparison

WeeChat already has this feature to color nicks differently of offline users' messages.

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Thank you for developing KVIrc!