contao/core — pull request #5661 by tristanlins (2013-04-16 02:33:42+00:00)
Title: Switch deprecated jquery accordion option `autoHeight:true` to `heightStyle:'content'`

I have my own customized jquery-ui 1.10.2 installed.
Maybe you must look for the version the new option belongs to.

See http://api.jqueryui.com/accordion/#option-heightStyle