Only display/register visible recipes

Respect the group not_in_craftguide.

init.lua

@@ -499,11 +499,16 @@ end
 function visible_items(data)
 	local ret = {}
 	for item,_ in pairs(data.held_items) do
+		if _ and item ~= "" then
 			table.insert(ret, item)
 		end
+	end
 	for item,_ in pairs(data.known_items) do
+		if _ and item ~= "" then
 			table.insert(ret, item)
 		end
+	end
+	table.sort(ret)
 	return ret
 end
 
@@ -529,9 +534,12 @@ function update_known_items(player, item_name)
 		-- Mark items craftable with this (and other) items as known.
 		local new_recipes = 0
 		for _,out_item_name in pairs(known_crafting_outputs(data, item_name)) do
+			data.known_items[out_item_name] = true
+			if show_item(minetest.registered_items[out_item_name]) then
 				new_recipes = new_recipes + 1
 				data.known_items[out_item_name] = true
 			end
+		end
 
 		-- Reset item-list.
 		data.items = visible_items(data)