cursorAt in events is not immediately effective

Problem:

The item cursor is not set correctly if you try to set the cursorAt options dynamically, for example, at the start, active, or drag event. When you try it a second time it works.

Demo:

http://jsbin.com/zobuvu/edit?js,output

Workaround:

A workaround is to set the offset.click object manually.

var instance = $(this).sortable('instance');
instance.offset.click.left = ui.item.width() / 2;
instance.offset.click.top = ui.item.height() / 2;