Reported here and not on github because I don’t know if it’s a bug.
I pressed “r” by accident, instead of s, and got a message “This action can only be used on a filtered deck”.
I assume “r” means something such as “refresh”, I’m not sure.
Given that I’m probably not the only one that probably press sometime the wrong key, I suggest also explaining to the user what the software assumed they want to do.
“It seems you tried to refresh the deck. This is impossible, as only filtered decks can be refreshed”
This way, if the user actually wanted to refresh something, they learn more about it. If they were not, they still know that everything is okay