Intelligent Autohide bad tolerances when on left edge

[Michael DeFrancesco]

When using Intelligent autohide and pressure reveal on plank on the bottom of the screen it works as expected.

If you then position plank on the left edge of the screen the tolerances for the autohide become finicky.

The dock will begin to appear ~2px before I hit the screen edge and quickly disappear. Therefore I Can only click on dock items if I very quickly catch the icon during the animation.

Moving plank to the bottom of the screen restores normal function.

$ plank --version
0.11.4