option to lock the mouse cursor on the game window

[s-goutrie]

When using 2 screens the mouse will move over to the other screen when reaching the end of the other one. Makes it impossible to scroll on the border to one side. Happens in Full screen mode and windowed mode.
There should be an option to lock the mouse to the game screen.

[victorleblais]

This behavior should be optional. I'm using multiple monitors as well and I simply hate when games take control of your cursor without any option do to otherwise.

[s-goutrie]

Oh, i was assuming this goes without saying.Of course i meant it to be optional.
I edited it in my original comment and the issue's name.

thanks for pointing out.

[andrewpey]

Done in 0.79.