Fix possible stacking of books in bookshelf

Original author: @MT-Modder

diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua
index 84f5f947f2e37fd615c9d2d9070cfd15b59cd57e..3fe0fe801ca603a9d235cb54b317c63f375989a5 100644 (file)
--- a/mods/default/nodes.lua
+++ b/mods/default/nodes.lua
@@ -407,8 +407,9 @@ minetest.register_node("default:bookshelf", {
        allow_metadata_inventory_put = function(pos, listname, index, stack, player)
                local meta = minetest.get_meta(pos)
                local inv = meta:get_inventory()
+               local to_stack = inv:get_stack(listname, index)
                if listname == "books" then
-                       if stack:get_name() == "default:book" then
+                       if stack:get_name() == "default:book" and to_stack:is_empty() then
                                return 1
                        else
                                return 0