When playing in Windowed mode side by side with another game, the scroll wheel works off the game screen for ONI. For example, if playing OSRS or with Firefox open (without clicking to select OSRS or Firefox) the scrollwheel affects both firefox and ONI instead of the application where the mouse is hovering. Clicking to select the other window stops this
Steps to Reproduce
Play in windowed mode side by side with an application that allows scrolling with scrollwheel. With the game selected, move the cursor over the other application and use the scroll wheel.
This issue has not been confirmed by a developer yet.