Trading table/bench

Do you also hate when your are trying to trade with your mate and they just take the stuff you just dropped, and don't hold there part of the deal. Then listen to this beautiful idea what if we had a tradingtable kind of thing. Where both of you would have to lay your stuff on let's say 20 diamonds for a diamond chestplate. Then both of you would have to lay your stuff on the table and and tab on a button to show that you agree with your trade and are ready to trade. And then after he has done the same and tapped yes. Then both of you would get 5 seconds (or more) to take the opposite thing. Fx. I take the diamods a agreed to get for my chestplate. And he get's the chestplate. This would be so helpfull both in multi player servers or just in a realm. But yea i really think we need this in Minecraft.