Thanks Kellie, I guess 100 just wasn't big enough, This is good to know. I also discovered if you re-name the column something longer, it will help as well.
I was hoping that would help but I guess it just didn't do the trick. A LOT of folks have mentioned that it does make the dropdown unreadable. I would say it's a bug, and needs fixing.
I think because the dialog includes multi-select (stacked) filters, how would it know when you're done selecting things in order to automatically close?