Keeping the cursor inside the box.....

Hey, not a very big issue since I can use the directional keys, but still this little nuisance is there. I am using a dual monitor set up, unfortunately with the last update, when I try to move the map using the mouse, I get 3 directions, but then on either the left or right side the cursor leaves the game going to the other monitor. thereby, preventing the map from moving. It's nothing big, not game breaking, just f'n annoying with an emphasis on the annoying.