dijit/Menu change breaks documented dijit/Tree context menu backward compatibility

[rtasarz]

After upgrade from 1.7.2 to 1.8.0 integration of context menu for dijit.Tree from http://dojotoolkit.org/reference-guide/1.7/dijit/Tree.html#context-menu no longer works as documented. That's because calling dijit.getEnclosingWidget() in old version returns instance of dijit._TreeNode where new one returns dijit.Tree. I haven't investigated yet why the change was made, but problem is caused by Menu.js line 170 call of self._scheduleOpen which now gets this as first argument instead of event.target. New call looks cleaner, but breaks documented use cases, so I'm not sure if change should be reverted and delayed till 2.0 or just mentioned in some docs. In the meantime best workaround I've found so far is:

 aspect.before(menu, "_openMyself", function(args){
       var rn = win.doc.elementFromPoint(args.coords.x, args.coords.y);
       var tn = dijit.getEnclosingWidget(rn);
       ...
 }

[bill]

Yes, that's why the ​new version of the reference guide documents the new way to do context menus. It's also discussed in the ​1.8 release notes.