Filtering and color changing* was in classic, although I dunno if they were in the UI, they were in and working in the .ini. SERVER-side filtering was early Velious. There was at least one abbreviation mode by late Kunark, but the whole separate window thing with multiple options was /hitsmode which was during Luclin.
*I don't think messages were as subdivided into categories though. Like the equivalent of "Other's Hits" was for PC, NPCs, and pets all rolled together.
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