Thank goodness. I was wondering how to achieve this when I first started messing around with xrandr back in ~2016 and saw that the rotation option wasn't limited to the four orthogonal directions, but would get a black screen any time I went for something unsquare. Didn't know you had to mark out the edges.
Another fun xrandr feature is not needing to have your display areas touch at the edges, so you can make your screens space accurate and lose your cursor and parts of windows behind bezels. You can have them overlap too, so you could have part of your screen shown on multiple displays.
I'm glad this functionality wasn't hampered by questions of necessity.
Another fun xrandr feature is not needing to have your display areas touch at the edges, so you can make your screens space accurate and lose your cursor and parts of windows behind bezels. You can have them overlap too, so you could have part of your screen shown on multiple displays.
I'm glad this functionality wasn't hampered by questions of necessity.