prevent person from enabling spawnit in an area if they don't control…

… the master area

compat/areas.lua

@@ -36,6 +36,17 @@ if spawnit.settings.spawn_in_protected_area then
 		return true
 	end)
 else
+	local function get_master_area(id)
+		local area = areas.areas[id]
+		local parent_id = area.parent
+		while parent_id do
+			id = parent_id
+			area = areas.areas[parent_id]
+			parent_id = area.parent
+		end
+		return id
+	end
+
 	minetest.register_chatcommand("area_spawnit", {
 		description = S("toggle mob spawning in an area (i.e. allow safe spawns in the area)"),
 		params = S("<area ID>"),
@@ -48,6 +59,9 @@ else
 			if not areas:isAreaOwner(id, name) then
 				return false, S("area @1 does not exist or is not owned by you.", tostring(id))
 			end
+			if not areas:isAreaOwner(get_master_area(id), name) then
+				return false, S("you do not control the master area here.")
+			end
 
 			local previous_spawnit_enabled = areas.areas[id].spawnit_enabled
 			if previous_spawnit_enabled == nil or previous_spawnit_enabled == false then