Holding a button in the trade window repeatidly repeats the latest action you did.

[CondoSlime]

Game version 0.25

Browser Chrome

Description I think this is best explained by showing. Holding a button repeats the latest action constantly. If I add fuel and then hold a button, it'll add fuel constantly. Same goes for removing items. This is annoying as it also applies to the "accept" button and can result in spending more items than you want.