Bug 313255

With wrap-around on for virtual desktops, the slide effect goes the wrong way when wrapping around. For example, with just two desktops in vertical alignment, move from upper to lower and the windows slide up as expected. Move back up and the windows slide down as expected. But move up from the upper to then wrap around and the slide effect still goes up. The slide should work in a loop so that any time the cursor goes off the top of the screen, the slide effect should be downward. Same issue with left and right.

Reproducible: Always

Steps to Reproduce:
1. Have multiple desktops
2. Enable wrap around and slide effect for switching
3. move through the desktops in a single direction wrapping around and notice that slide isn't in a consistent direction even though cursor movement is consistent