It's not obvious to me what to do with fullscreen mode and scaling
factors.

If you are fullscreening an app like a browser then it should follow the
configured scaling factor.

If you are fullscreening a game that does not care about desktop scaling
factors then its buffer should never be scaled or blurred, which I think
is the problem here.

Although in both cases one could argue that rendering a fullscreen
window at 2x resolution (4x the number of pixels) is never acceptable
for performance and scaling factors should be ignored if they would
require increasing the render resolution of a fullscreen window.

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https://bugs.launchpad.net/bugs/2119415

Title:
  Xorg fractional scaling is making fullscreen games blurry

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