ChatFrame2 now shows the 4.x combat log, ported from Classic Era's
Blizzard_CombatLog as the combatlog module. ClassicAPI's COMBAT_LOG_EVENT,
CombatLogAddFilter and kept entries drive it, and changing filter refills
the frame with BackFillMessage. Quick buttons sit above the log, and its
unit, spell, raid icon and action links open Blizzard's filter menus.
Filters save account-wide in pfUI_combatlog.
The 1.12 CHAT_MSG_COMBAT_* and CHAT_MSG_SPELL_* events no longer reach
ChatFrame2. Its message groups stay saved, so disabling the module brings
the text log back.
env/combatlog_<locale>.lua hold the Classic Era GlobalStrings the log reads
that 1.12 lacks.
pfGridmath listed every exact cols x rows grid per bar size; the only
live use was seeding the layout dropdown, which a divisor loop now does.
Everything else that read it was unreachable: every layout option is a
"cols x rows" string, so ResolveBarLayout's BarLayoutFormfactor lookup
never matched, and the actionbar module resets a stored layout that
isn't one before BarLayoutSize/BarButtonAnchor run, so their fallbacks
never fired. BarLayoutFormfactor and env/tables.lua go with it.
Brues