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[SDL] Fractional scaling is blurry
Description of problem:
The display looks blurry
Steps to reproduce:
1. Use a Wayland compositor (eg. Sway) with scale set to `1.25`
2. Launch an Ubuntu guest with the SDL display
3. Notice blurryness
Additional information:
https://github.com/libsdl-org/SDL/issues/6438

Blurry display https://user-images.githubusercontent.com/67585967/197484538-fde750aa-8982-4ac2-9d83-3861f6411a31.png

Display with 1.00 scale https://user-images.githubusercontent.com/67585967/197484417-afd1d1c5-5ea1-46ce-82c5-fa8d9b2df459.png

It was suggested in the SDL issue (https://github.com/libsdl-org/SDL/issues/6438#issuecomment-1289513402) that it's caused by the `SDL_WINDOW_ALLOW_HIGHDPI` not being set. However, after setting that flag, the display is sharp again but it's not scaled properly (boxed) https://github.com/libsdl-org/SDL/issues/6438#issuecomment-1291663284, no idea what other changes need to be made.