coa-elvui/ElvUI/Modules/UnitFrames/Groups/RaidPets.lua

local E, L, V, P, G = unpack(select(2, ...)); --Import: Engine, Locales, PrivateDB, ProfileDB, GlobalDB
local UF = E:GetModule("UnitFrames")
local _, ns = ...
local ElvUF = ns.oUF
assert(ElvUF, "ElvUI was unable to locate oUF.")

--Lua functions
--WoW API / Variables
local CreateFrame = CreateFrame
local GetInstanceInfo = GetInstanceInfo
local InCombatLockdown = InCombatLockdown
local RegisterStateDriver = RegisterStateDriver
local UnregisterStateDriver = UnregisterStateDriver

function UF:Construct_RaidpetFrames()
	self:SetScript("OnEnter", UnitFrame_OnEnter)
	self:SetScript("OnLeave", UnitFrame_OnLeave)

	self.RaisedElementParent = CreateFrame("Frame", nil, self)
	self.RaisedElementParent.TextureParent = CreateFrame("Frame", nil, self.RaisedElementParent)
	self.RaisedElementParent:SetFrameLevel(self:GetFrameLevel() + 100)

	self.Health = UF:Construct_HealthBar(self, true, true, "RIGHT")
	self.Name = UF:Construct_NameText(self)
	self.Portrait3D = UF:Construct_Portrait(self, "model")
	self.Portrait2D = UF:Construct_Portrait(self, "texture")
	self.Buffs = UF:Construct_Buffs(self)
	self.Debuffs = UF:Construct_Debuffs(self)
	self.AuraWatch = UF:Construct_AuraWatch(self)
	self.RaidDebuffs = UF:Construct_RaidDebuffs(self)
	self.DebuffHighlight = UF:Construct_DebuffHighlight(self)
	self.TargetGlow = UF:Construct_TargetGlow(self)
	self.MouseGlow = UF:Construct_MouseGlow(self)
	self.ThreatIndicator = UF:Construct_Threat(self)
	self.RaidTargetIndicator = UF:Construct_RaidIcon(self)
	self.HealCommBar = UF:Construct_HealComm(self)
	self.Fader = UF:Construct_Fader()
	self.Cutaway = UF:Construct_Cutaway(self)
	self.customTexts = {}

	self.unitframeType = "raidpet"

	UF:Update_StatusBars()
	UF:Update_FontStrings()

	self.db = UF.db.units.raidpet
	self.PostCreate = UF.Update_RaidpetFrames

	return self
end

--I don"t know if this function is needed or not? But the error I pm'ed you about was because of the missing OnEvent so I just added it.
function UF:RaidPetsSmartVisibility(event)
	if not self.db or (self.db and not self.db.enable) or (UF.db and not UF.db.smartRaidFilter) or self.isForced then return end
	if event == "PLAYER_REGEN_ENABLED" then self:UnregisterEvent("PLAYER_REGEN_ENABLED") end

	if not InCombatLockdown() then
		local _, instanceType = GetInstanceInfo()
		if instanceType == "raid" then
			UnregisterStateDriver(self, "visibility")
			self:Show()
		elseif self.db.visibility then
			RegisterStateDriver(self, "visibility", self.db.visibility)
		end
	else
		self:RegisterEvent("PLAYER_REGEN_ENABLED")
		return
	end
end

function UF:Update_RaidpetHeader(header, db)
	header.db = db

	local headerHolder = header:GetParent()
	headerHolder.db = db

	if not headerHolder.positioned then
		headerHolder:ClearAllPoints()
		headerHolder:Point("BOTTOMLEFT", E.UIParent, "BOTTOMLEFT", 4, 574)

		E:CreateMover(headerHolder, headerHolder:GetName().."Mover", L["Raid Pet Frames"], nil, nil, nil, "ALL,RAID10,RAID25,RAID40", nil, "unitframe,raidpet,generalGroup")
		headerHolder.positioned = true

		headerHolder:RegisterEvent("PLAYER_LOGIN")
		headerHolder:RegisterEvent("ZONE_CHANGED_NEW_AREA")
		headerHolder:SetScript("OnEvent", UF.RaidPetsSmartVisibility)
	end

	UF.RaidPetsSmartVisibility(headerHolder)
end

function UF:Update_RaidpetFrames(frame, db)
	if not db then
		db = frame.db
	else
		frame.db = db
	end

	frame.Portrait = frame.Portrait or (db.portrait.style == "2D" and frame.Portrait2D or frame.Portrait3D)
	frame.colors = ElvUF.colors
	frame:RegisterForClicks(self.db.targetOnMouseDown and "AnyDown" or "AnyUp")

	do
		if self.thinBorders then
			frame.SPACING = 0
			frame.BORDER = E.mult
		else
			frame.BORDER = E.Border
			frame.SPACING = E.Spacing
		end
		frame.SHADOW_SPACING = 3

		frame.ORIENTATION = db.orientation --allow this value to change when unitframes position changes on screen?

		frame.UNIT_WIDTH = db.width
		frame.UNIT_HEIGHT = db.height

		frame.USE_POWERBAR = false
		frame.POWERBAR_DETACHED = false
		frame.USE_INSET_POWERBAR = false
		frame.USE_MINI_POWERBAR = false
		frame.USE_POWERBAR_OFFSET = false
		frame.POWERBAR_OFFSET = 0
		frame.POWERBAR_HEIGHT = 0
		frame.POWERBAR_WIDTH = 0

		frame.USE_PORTRAIT = db.portrait and db.portrait.enable
		frame.USE_PORTRAIT_OVERLAY = frame.USE_PORTRAIT and (db.portrait.overlay or frame.ORIENTATION == "MIDDLE")
		frame.PORTRAIT_WIDTH = (frame.USE_PORTRAIT_OVERLAY or not frame.USE_PORTRAIT) and 0 or db.portrait.width

		frame.CLASSBAR_YOFFSET = 0
		frame.BOTTOM_OFFSET = 0

		frame.VARIABLES_SET = true
	end

	if not InCombatLockdown() then
		frame:Size(frame.UNIT_WIDTH, frame.UNIT_HEIGHT)
	else
		frame:SetAttribute("initial-width", frame.UNIT_WIDTH)
		frame:SetAttribute("initial-height", frame.UNIT_HEIGHT)
	end

	--Health
	UF:Configure_HealthBar(frame)

	--Name
	UF:UpdateNameSettings(frame)

	--Portrait
	UF:Configure_Portrait(frame)

	--Threat
	UF:Configure_Threat(frame)

	--Auras
	UF:EnableDisable_Auras(frame)
	UF:Configure_Auras(frame, "Buffs")
	UF:Configure_Auras(frame, "Debuffs")

	--RaidDebuffs
	UF:Configure_RaidDebuffs(frame)

	--Raid Icon
	UF:Configure_RaidIcon(frame)

	--Debuff Highlight
	UF:Configure_DebuffHighlight(frame)

	--OverHealing
	UF:Configure_HealComm(frame)

	--Fader
	UF:Configure_Fader(frame)

	--Cutaway
	UF:Configure_Cutaway(frame)

	--BuffIndicator
	UF:UpdateAuraWatch(frame, true) --2nd argument is the petOverride

	--CustomTexts
	UF:Configure_CustomTexts(frame)

	frame:UpdateAllElements("ForceUpdate")
end

--Added an additional argument at the end, specifying the header Template we want to use
UF.headerstoload.raidpet = {nil, nil, "SecureGroupPetHeaderTemplate"}