Add mover, drag-disable, and reset-position filter for LayerPickerFrame

Adds the button to ElvUI's anchor/mover system, disables native dragging so it doesn't conflict, filters the now-broken "Reset Position" dropdown entry (scoped to this menu only), and raises the mover overlay above the minimap so it's grabbable in config mode.

Modules/LayerPicker.lua

@@ -3,6 +3,59 @@ local CoA = E:GetModule("CoA")
 
 local BUTTON_NAME = "LayerPickerFrame"
 
+do
+	local orig_AddButton = UIDropDownMenu_AddButton
+	UIDropDownMenu_AddButton = function(info, level)
+		if info and info.text == "Reset Position" and UIDROPDOWNMENU_INIT_MENU == LayerPickerFrameDropDown then
+			return
+		end
+
+		return orig_AddButton(info, level)
+	end
+end
+
+local function DisableDrag(button)
+	if button.CoADragDisabled then return end
+	button.CoADragDisabled = true
+
+	button:SetScript("OnDragStart", nil)
+	button:SetScript("OnDragStop", nil)
+end
+
+local function SetupMover(button)
+	if CoA.layerPickerMoverCreated then return end
+
+	local width, height = button:GetSize()
+	if width == 0 or height == 0 then return end
+
+	local left, bottom = button:GetLeft(), button:GetBottom()
+	if not left or not bottom then return end
+
+	CoA.layerPickerMoverCreated = true
+
+	local holder = CreateFrame("Frame", "CoA_LayerPickerHolder", E.UIParent)
+	holder:Size(width, height)
+	holder:Point("BOTTOMLEFT", E.UIParent, "BOTTOMLEFT", left, bottom)
+
+	E:CreateMover(holder, "CoA_LayerPickerMover", "Instance", nil, nil, nil, nil, nil, "CoA,skin,instance")
+	holder:SetAllPoints(_G["CoA_LayerPickerMover"])
+	_G["CoA_LayerPickerMover"]:SetFrameStrata("FULLSCREEN")
+
+	local function Anchor()
+		button:ClearAllPoints()
+		button:SetPoint("CENTER", holder, "CENTER")
+	end
+
+	if InCombatLockdown() then
+		CoA:RegisterEvent("PLAYER_REGEN_ENABLED", function()
+			Anchor()
+			CoA:UnregisterEvent("PLAYER_REGEN_ENABLED")
+		end)
+	else
+		Anchor()
+	end
+end
+
 local function SkinButton(button)
 	if button.CoASkinned then return end
 	button.CoASkinned = true
@@ -22,9 +75,14 @@ end
 local function TryHook()
 	local button = _G[BUTTON_NAME]
 
-	if button and E.private.CoA.instance then
+	if button then
+		DisableDrag(button)
+		SetupMover(button)
+
+		if E.private.CoA.instance then
 			SkinButton(button)
 		end
+	end
 
 	return button ~= nil
 end