feat: remove parted channel from tab bar

irc/handler/handler.go

@@ -131,10 +131,19 @@ func handlePart(msg parser.IRCMessage, client *irc.Client) {
 
 	for i, c := range client.Channels {
 		if c.Name == channel {
+			if nick == client.Nickname {
+				client.Channels = append(client.Channels[:i], client.Channels[i+1:]...)
+				if client.ActiveChannelIndex >= i {
+					client.ActiveChannelIndex--
+					client.ActiveChannel = client.Channels[client.ActiveChannelIndex].Name
+				}
+				client.LastTabIndexInTabBar--
+			} else {
 				client.Channels[i].History += partMsg + irc.CRLF
 				delete(client.Channels[i].Users, nick)
 			}
 		}
+	}
 
 	client.Tea.Send(cmds.SwitchChannels())
 }