[bug]: closing the panel doesn't relinquish focus

[GetPsyched]

I have my panel set to hide automatically. When I interact with the panel, and then move my mouse away, the focus isn't relinquished and remains with the panel that is now out of view. I'd expect it to give back focus to the last used window after it closes.

This is loosely related to pop-os/cosmic-epoch#324 and #582