Dropdowns aren't correctly isolating / blocking key bindings

[peppy]

Discussed in https://github.com/ppy/osu/discussions/25766

^{Originally posted by Loreos7 December 15, 2023}

https://github.com/ppy/osu/assets/86934170/efb2c290-d733-46e6-bc33-9ebce52413f4

Even default Space binding.

[Joehuu]

Another case: https://github.com/ppy/osu/discussions/27914