Enhance performance for large data sets - remove aria-level and aria-setsize attributes as they can be inferred from DOM

[Dimitar-Goshev]

Description

Since 2022.2.802 TreeView renders aria-level and aria-setsize ARIA attributes to its nodes to enhance its Accessibility compliance. Currently this results in decreased performance with large data sets.

Workaround

Override the _ariaItems() method before initializing the TreeView:
kendo.ui.TreeView.prototype._ariaItems = function() { return false; }

Reproduction of the problem

1. Run the following Dojo snippet and check times logged in console

Current behavior

TreeView loads in about 2 seconds

Expected/desired behavior

TreeView loads in less then 0.5 sec - https://dojo.telerik.com/@Dimitar-Goshev/EyowoxiX

Environment

• Kendo UI version: 2022.3.913
• Browser: all

[veselints]

We decided to entirely remove the _ariaItems() method.