jquery/jquery-ui — pull request #1019 by collegeman (2013-06-27 15:25:55+00:00)
Title: beforestart event in ui.sortable

We need this event such that modifications to a sortable's elements that affect those elements dimensions can be made before those dimensions are cached. For a solid description of this use case, please refer to this thread: http://stackoverflow.com/questions/2818773/jquery-ui-sortable-how-to-emulate-the-beforestart-event