Comment 19 for bug 1687246

You should not only be able to have different fractal scaling for each monitor, but you should also be able to have fractal scaling for each separate window you launch.

Back around 2008, Mandriva released a desktop called Metisse that allowed (seemingly infinite) fractional scaling for each window! (much less is per monitor granularity) Here's a video of that in action:
https://www.youtube.com/watch?v=dxsUKX6xXyE&t=40s

To accomplish this, using Metisse, you'd simply hold down shift (or was it ctrl) while resizing the window.

You could do almost anything to that window, and all your mouse actions on that window would still work accurately no matter how you scaled it. You could even do silly impractical things like turn the window up-side-down, pivot it, push the left side of the window deeper into the background than the right side, etc. And, all your interactions with that window would still work accurately. It was amazing (and done on Linux first -- 10 years ago).

When will the world catch up with what Metisse accomplished in 2008? It was way ahead of its time.

Here's an academic paper on Metisse: https://hal.inria.fr/inria-00533597/document