jquery/jquery-ui — pull request #504 by TheLudd (2011-10-22 16:48:46+00:00)
Title:  Fixed #7769 - selectable: An option needed to enable multiple selection by default.

I fixed issue #7769 by changing roughly 1.5 lines of code. I have tested it in my local enviroment, and i works fine with the new value (multipleByDefault) set to true, false or not at all.