Desktop background not antialiased in workspace previews
I'm on gnome-shell 3.32.2 on Arch Linux.
In the workspace previews in the activities overview, whilst it looks like the windows themselves on each workspace are rendered with antialiasing, the desktop background is not.
Here is a screenshot showing the desktop background and the preview of it in the workspace switcher. The background has some detailed lines that appear jagged in the preview.
Here I've edited in an antialised thumbnail of the desktop for comparison:
You may need to download the images/open in a new tab and view at 1:1 scale to see the difference, to avoid further scaling from your browser.