Add a list of permanent channels, on each IRC-server
Add an option (of type “string-list”) on each IRC server, to maintain a list of channels that should not be left (do not send a PART message to the channel) when the last resources leaves it.
Also, an option (boolean) to automatically add channel’s names to this list whenever a new channel is joined.
This is useful to make biboumi act like a “bouncer”, in conjunction with #3229 (closed).
The only way to leave these channels would be to manually send a PART message to them, using a raw command, or to disconnect from the server.
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