To dip my toes into the oncoming clusterpocalypse that is Wayland, I thought I'd try something "simple"... Let's see if there's some way to make XScreenSaver hacks able to grab and manipulate screenshots under XWayland. Here is what I have learned so far:
https://jwz.org/b/ykqC
If you have a fediverse account, you can quote this note from your own instance. Search https://mastodon.social/users/jwz/statuses/114740725143058044 on your instance and quote it. (Note that quoting is not supported in Mastodon.)