I'm trying to exclude dmenu from compton shadows, but haven't had much luck so far. So I figured, I'd find out what's even in the tree.
i3-msg -t 'get_tree' once without dmenu and then once when dmenu was open via
sleep 3 && …. Comparing both dumps, they are exactly the same right down to the last byte.
How is that? Shouldn't dmenu be a (floating?) window? Why does i3 not see it, but compton still renders a shadow?