Add LayerPickerFrame skinning with Instance toggle

Strips the native tooltip-style backdrop pieces off the LayerPickerFrame button and applies the ElvUI backdrop/button style, gated by a new Instance checkbox in the Skins tab.

Modules/LayerPicker.lua

@@ -0,0 +1,41 @@
+local E, L, V, P, G = unpack(ElvUI)
+local CoA = E:GetModule("CoA")
+
+local BUTTON_NAME = "LayerPickerFrame"
+
+local function SkinButton(button)
+	if button.CoASkinned then return end
+	button.CoASkinned = true
+
+	local name = button:GetName()
+	local text = _G[name.."Text"]
+
+	button:StripTextures(true)
+	button:CreateBackdrop("Default")
+	button:StyleButton()
+
+	if text then
+		text:FontTemplate()
+	end
+end
+
+local function TryHook()
+	local button = _G[BUTTON_NAME]
+
+	if button and E.private.CoA.instance then
+		SkinButton(button)
+	end
+
+	return button ~= nil
+end
+
+function CoA:InitializeLayerPicker()
+	if TryHook() then return end
+
+	self.layerPickerTimer = self:ScheduleRepeatingTimer(function()
+		if TryHook() then
+			self:CancelTimer(self.layerPickerTimer)
+			self.layerPickerTimer = nil
+		end
+	end, 0.5)
+end