Feature request: Relative mouse mode (easier for Dune tests)

[maximilien-noal]

[maximilien-noal]

I looked into this, and DOSBox relies on SDL relative mode for this feature.

Avalonia lacks this feature. So it's not possible.

HTML5 has this feature: https://developer.mozilla.org/en-US/docs/Web/API/Pointer_Lock_API

[maximilien-noal]

Aeon does have a mouse lock feature, but that's a bit different.