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Twitter post by Daniel Feldman (@d_feldman): Linux is the only major operating system to support diagonal mode (credit [Twitter] @xssfox). Image shows an untrawide monitor rotated about 45 degrees, with a horizontal IDE window taking up a bottom triangle. A web browser and settings menu above it are organized creating a window shape almost like a stepped pyramid.
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I remember seeing the video of this. The guy was doing it for shits and giggles, but it ended up looking great!
Can you link it?
No idea what it was, sorry. One of the youtube recommendations at the time.