Originally Posted by Resike
Why would you do that instead of creating a custom function/hook for yourself only?
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For example...
A chat addon that alters/adds to messages before printing them in the chat frame. You have to catch the string first, edit the it, then continue to pass it through the frame's AddMessage method.
This is how addons add links to things (quests, etc.) in your chat frame. Add time stamps. Color names by class. Filter unwanted messages.