Merfolk Spy - each reveal overwrites previous.

I had played a game where I got to keep revealing something - perhaps the top card of opponents library - and it kept opening new windows each time, so I was able to keep all the reveals visable and have a better idea of what was in my opponents hand. I don't recall what card gave me those reveals.
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Conversely, I recently played a game with Merfolk Spy, and each time it did a reveal, it reused the old window and changed the card visable in that window - so no longer showed the information from the last reveal.
It would be nice if with each reveal, Merfolk Spy opened a new window so that the user could keep the relevant ones open and visable - and close the ones that are no longer relevant as desired.

Start by locating the Merfolk Spy implementation and the reveal-window handling it uses. Reproduce repeated reveals and compare the behavior with the requested interaction; done means each reveal remains visible in its own window instead of replacing the previous reveal.

Written by the indexing model from the issue text.