Fix copied maps not retaining marker information

items.lua

@@ -149,6 +149,10 @@ function cartographer.create_map_item(size, detail, scale)
     return map;
 end
 
+-- Create a copy of the given map
+-- stack: An itemstack containing a map
+-- 
+-- Returns an itemstack with the copied map
 function cartographer.copy_map_item(stack)
     local meta = stack:get_meta();
 
@@ -169,6 +173,9 @@ function cartographer.copy_map_item(stack)
         for k,v in pairs(src.fill) do
             dest.fill[k] = v;
         end
+        for k,v in pairs(src.markers) do
+            dest.markers[k] = v;
+        end
 
         copy_meta:set_int("cartographer:map_id", new_id);
         copy_meta:set_string("description", "Map #" .. tostring(new_id) .. "\n[" .. tostring(fromchunk(dest.x)) .. "," .. tostring(fromchunk(dest.z)) .. "] - [" .. tostring(fromchunk(dest.x + dest.w)) .. "," .. tostring(fromchunk(dest.z + dest.h)) .. "]")

table.lua

@@ -415,7 +415,6 @@ minetest.register_on_player_receive_fields(function(player, name, fields)
 
                     inv:set_stack("copy_output", 1, cartographer.copy_map_item(in_stack));
                 end
-
             end
 
             table_formspec(player:get_player_name(), 3)