jquery/jquery-ui — pull request #1211 by aronduby (2014-03-11 17:05:32+00:00)
Title: Draggable: Padding and Border Containment

When setting containment to an element you can now pass it an object
with container being the element to contain to and dragInPadding and
dragInBorder booleans to have the constraint include or exclude padding and
borders. Default is to not be able to drag in padding or border