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GNOME Devs Are Working on a New Window Management System
(9to5linux.com)
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Krohnkite went unmaintained a while ago, which is when Bismuth forked from it. So, Bismuth is basically a straight upgrade. The dev implemented tons of features, which you may or may not need, but I think, there were also some fixes for stability and Plasma version compatibility.
Polonium came about, because Plasma 5.27 introduced a (manual) tiling system of its own, which partially broke Bismuth, but also meant it made sense to develop a new KWinScript, which makes use of this native system.
As such, it is a step back from Bismuth. I think, it's roughly comparable to Krohnkite in terms of features now, but still a very young project, so not as stable yet...
Interesting! Krohnkite still works so well for my use case that I didn't even realize it was unmantained. I'll give those two a shot!