Tree: Extend dijit.Tree to allow styling of complete row

[shaneosullivan]

The dijit.Tree widget currenltly allows the user to apply styles to labels and icons, but there is no facility for adding a CSS class to the rowNode.

The prevents customizations such as varying backgrounds on a per-node basis.

The solution would be similar to that used for icons:

1. Add a function 'addRowClass' to the tree, which users can override.
2. Change the '_updateItemClasses' on dijit._TreeNode to use this function to get the CSS class to apply to the rowNode

[shaneosullivan]

Correction: the function should be called 'getRowClass', not 'addRowClass'

[bill]

Sounds reasonable, go ahead if you want to patch that. I sort-of regret adding getIconClass() and getLabelClass() since all could be achieved from this one new method, but too late now.

[shaneosullivan]

Patch to resolve this issue. I refactored the dijit._TreeNode a little, as it was duplicating the same process 3 times.

[bill]

Great, looks good to me.

[shaneosullivan]

Changes made in [20363]. Not sure why the reference is not showing up in this ticket.