[Retail 12.0] Tooltip/_Core.lua:160 - Taint error on unit tooltip (UnitIsAFK secret boolean)

[devRavit]

Environment

• WoW Version: 12.0.5 (Retail)
• SUI Version: 12.0.4 (2026-03-14)

Description

When hovering over a party/raid member's unit frame, the following Lua error is thrown repeatedly:

Interface/AddOns/SUI/Modules/Tooltip/_Core.lua:160: attempt to perform boolean test on a secret boolean value (tainted by 'SUI')

Steps to Reproduce

1. Enable SUI Tooltip module with Style set to "Custom"
2. Hover over a party or raid member's unit frame while in combat
3. Error fires repeatedly (80+ times per session)

Root Cause

In _Core.lua line 160, UnitIsAFK(unit) returns a secret boolean in WoW 12.0's new security model. Performing a direct if test on it causes a taint violation:

-- Line 160 (problematic)
if UnitIsAFK(unit) then
    self:AppendText((" |cff%s<AFK>|r"):format(cfg.afkColorHex))
end

This is similar to the already-reported issue in #221 (raidIconIndex secret value), but affects a different line and function.

Suggested Fix

UnitIsAFK() returns a secret boolean that cannot be tested in any form during combat — even via pcall, the returned value itself causes a taint error when used in a conditional.

The correct fix is to skip the check entirely during combat using InCombatLockdown():

-- Fix: skip AFK check during combat (secret boolean cannot be tested while tainted)
if not InCombatLockdown() and UnitIsAFK(unit) then
    self:AppendText((" |cff%s<AFK>|r"):format(cfg.afkColorHex))
end

Since players cannot be AFK during combat, this fix has no functional impact on the AFK display feature.

Related Issues

• LUA errors in pre-patch #221 (same taint pattern, different line)