Comment 10 for bug 1073724

Given two monitors of unequal size

 +----------------+---------------------+
 | | |
 | | |
 | | |
 | X |
 +----------------X |
                  | |
                  | |
                  +---------------------+

And a pointer barrier at the location labelled X, its possible to mouse underneath the barrier from left to right and onto the second monitor.

Reproduced with xorg-x11-server-Xorg-1.12.0-2.fc17.x86_64

(Using GNOME 3 you can reproduce by setting up two monitors like this with the primary monitor on the left - a pointer barrier will be set up at position X to make the hot corner at the bottom left. Try mousing along the bottom row of pixels on the left monitor. This leak is not observed if the two monitors are the same size, indicating that the pointer barrier is correctly positioned.)