When a background app takes time to close due to processing or any other reason, the GNOME desktop now shows a spinner in place of the close button, affirming to the user that the app is working and should be closed soon. MR2732
Kind of funny that they used neovim to show an example of slow closing app, when it's instant. :)
GNOME 45 also implements top-level surface rounding as needed by the fractional-scale-v1 specification. This will enable pixel-perfect rendering when you enable fractional scaling under Wayland. In addition, “stable rounding” for Wayland subsurface positions also arrives in this release. You can learn more in MR2726.
This is awesome. Gnome works well for me on a 4k screen but this will improve it even more.