Cache + Watchtower unclear what you're trashing

[squirezucco]

I had $5 and a watchtower in hand, and bought a cache. I don't have a game number, but it's probably not critical here because it's an interface confusion, not a bug. It wasn't completely obvious which card I was gaining when I had to decide whether to trash. I wound up trashing cache/copper and keeping a copper (instead of trashing copper/copper). I suspect that if I had read closely, I could have done it right, but it wasn't obvious, and i did it wrong.

This problem was compounded by my opponent refusing to allow an undo (which appalled me), but I thought I'd report that it's not entirely clear what's happening. I think showing a picture of the card to be gained would be better,
so you don't need the log to see what's happening, and so that all players would know what's being trashed and what's not.