Adds a message type to the saved list of those displayed in a chat window. Used by the default UI's function ChatFrame_AddMessageGroup(), which manages the set of message types shown in a displayed ChatFrame.
See also Chat functions.
Signature:
AddChatWindowMessages(index, "messageGroup")
Arguments:
index- Index of a chat frame (between1andNUM_CHAT_WINDOWS) (number)messageGroup- Token identifying a message type (string, chatMsgType)