Draggable: Don't recalculate the relative offset during drag. I couldn't reproduce the issues described in the comments for this code.
Draggable: Don't recalculate the relative offset during drag. I couldn't reproduce the issues described in the comments for this code.

Fixes #4824 - draggable broken on inline elements in webkit browsers

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension