Mac OS window shadow disappears for transparent windows after switching away using Mission Control

Starting from the window example, if you enable transparency on the window, then switch away using Mission Control, the window's shadow disappears when it's not foreground. Since it's complicated to explain preisely, I've made a screen recording. I used a third app (TextEdit) because switching back to Terminal did't seem to trigger the bug.

https://github.com/rust-windowing/winit/assets/27617/2a1c779f-b876-4c12-a377-787ee8f5c0b5

The issue originates from https://github.com/neovide/neovide/issues/1888. Since MacOS uses the shadow to represent the window's edge, it's not just an aesthetic annoyance, it causes overlapping windows with lots of text to visually blend together.

There seems to be a rectangular artifact in the top-left corner of the window; perhaps the window manager thinks the window is very small and the rectangle is the shadow it draws?

Start with the window example and reproduce the issue by enabling transparency, switching away with Mission Control, and switching back via a third app such as TextEdit. Investigate the macOS window behavior shown in the recording and screenshot; done means the shadow remains visible for transparent, non-foreground windows without the top-left artifact.