make detached trade_inv beeing sent only to the player it belongs to and delete it when the player leaves

api/api_trade_inv.lua

@@ -221,7 +221,8 @@ yl_speak_up.player_joined_add_trade_inv = function(player, last_login)
 	        on_take = function(inv, listname, index, stack, player)
 			return yl_speak_up.trade_inv_on_take(inv, listname, index, stack, player)
 		end,
-	})
+	-- create the detached inventory only for that player (don't spam other clients with it):
+	}, tostring(pname))
 	-- prepare the actual inventories
 	trade_inv:set_size("pay", 1)
 	trade_inv:set_size("buy", 1)
@@ -233,3 +234,12 @@ yl_speak_up.player_joined_add_trade_inv = function(player, last_login)
 	-- for setting wielded items (left and right)
 	trade_inv:set_size("wield", 2)
 end
+
+
+yl_speak_up.player_left_remove_trade_inv = function(player)
+	if(not(plaer)) then
+		return
+	end
+	local pname = player:get_player_name()
+	minetest.remove_detached_inventory("yl_speak_up_player_"..tostring(pname))
+end

register_once.lua

@@ -53,6 +53,7 @@ minetest.register_privilege("npc_talk_admin", npc_talk_admin_priv_definition)
 minetest.register_on_leaveplayer(
     function(player)
 	yl_speak_up.reset_vars_for_player(player:get_player_name(), true)
+	yl_speak_up.player_left_remove_trade_inv(player)
     end
 )