Fix #3312 ExtJS Tree Checkbox Update

[justinbeaty]

Description (*)

PR #2473 upgraded ExtJS from 1.0.1 to 1.1.1, but there was a breaking change in that library. So, the extjs-tree-checkbox.js file needed to be updated. The checkbox tree file was not part of ExtJS, but a plugin that somebody wrote and included into Magento. Luckily, the author wrote a comment with the fix.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes ownerTree.container is undefined for product categories #3312

Manual testing scenarios (*)

1. Go to Products > Any Product > Categories, at store view level
2. Should see no errors

Questions or comments

We have an alternate solution:

var targetNode = 
    n.parentNode ? n.parentNode.ui.getContainer() : 
    (n.ownerTree.container ? n.ownerTree.container.dom : n.ownerTree.innerCt.dom);

But I don't think it's necessary, since ExtJS renamed container -> innerCt. The above would only be necessary if we need to support someone who is still using ExtJS 1.0.1.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[fballiano]

works!