Osu: Cursor can leave the screen boundaries in fullscreen mode

[Squaduck]

Describe the bug:
In fullscreen, I can drag my cursor way out of where it should be
Screenshots or videos showing encountered issue:

osu!lazer version:
2020.1009.0
Logs:
database.log
network.log
performance.log
performance-draw.log
performance-update.log
runtime.log
updater.log

[Joehuu]

Duplicate of https://github.com/ppy/osu-framework/issues/2247. Will just leave this issue open for visibility in this repo.

[YuwaneHaku]

In borderless，it can happen, too.

[beastdestroyer]

Still happens in latest lazer: 2020.1020.0

[peppy]

Yes, it still happens. Because the issue is still open.

[Joehuu]

Doesn't seem to be fixed in SDL (at least on Windows 10), with raw input enabled.

Before https://github.com/ppy/osu/pull/11060 was merged though, it would confine in a weird way (i.e. cursor will go off screen for ~one pixel, and moving it more off will make it appear fully on screen again.

[peppy]

Solution here should be to force confine mode when fullscreen (framework side, probably).

[peppy]

I'm looking to fix this, but it would seem that behaviour is different within a VM as opposed to a native windows install. I am pretty sure that what we want to do is remove the "never" option from confine modes (as we generally always want to confine to the game window when running fullscreen).

If this is the case, we have two options: Either not exposing "never" at the osu!-side, or removing it as an option from framework. Not sure if there's a use case for it in other projects, though... can potentially be considered the behaviour one may want if making a FPS game for example, so it may be best to leave for now.

Will get to providing a solution and testing further when i'm at my windows box.