I\'ve following piece of code in my application which is written in Dojo 1.3.1. My task if to migrate this code to Dojo 1.9.3. My questions is
This part of Dojo migration guide should help you out.
As on what this does -- you're pushing a (Dojo) connect even handler, that would execute an onLoad method of dialogWidget after newDialog._fadeIn fires onEnd event. What for -- I can't really say, since I don't know the context this one is run in. Also since it accesses private property of dialogWidget, I wouldn't be surprised that this would break during update.
Hope this helps.