So a summary of what's been done in this fork/PR. Instead of moving the cursor, we're warp_closest ing. warp_absolute didn't work, so warp closest has kindof an auto constrain feature so it works beautifully. I'm also contraining to the right side of the window - 1, because the cursors are treating that pixel as the next pixel over, so it was actually thinking it was on the next monitor (assuming fullscreen) when the cursor got to the right or bottom of the window. TL;DR rounding issue.
This fix didn't work when you had a fullscreen video playing on a monitor beside, so I also fixed that by ignoring all focus changes or whatever when a constraint actually occured, we obviously just don't want to focus another monitor when constrained, so why not just *disable it when a constraint happened*
The PR is now ready, I love Hyprland, and I can't wait to contribute more :)
One failure case: When there is a fullscreen window directly to the right of a game, for example, in a multimonitor setup, then the cursor will bug out in between the monitors. sometimes it will get constrained to the border, but just outside the window (which is what this PR fixes, so it's unusual) and sometimes the cursor will just ignore the constraint entirely. However this is only in the one case.
The window properly constrains the mouse now
I do still notice a bug with moving the mouse in games, if you don't move the mouse fast enough, some games will not register the mouse movement. This doesn't happen in KDE so I know it's related somehow
