I can't quite tell but it looks like DartLS has hung up either Neovim or Neovide. The clock is behind (I took this at 19:33, the clock is hung at 19:27...) and it's not responding.
I should make sure Neovide is up to date.
Discussion
Updated Neovide. I should probably write an Upgrade script for Neovide (although I feel like I already have it but don't remember). It hasn't hung yet, but the toolbar is now dark gray instead of glaring white, which is a huge step up. 0.11.0 apparently fixed some Wayland bugs which should definitely improve my experience, as I'm on Wayland.