Issue - While restoring the tree list state from local storage any items that were expanded are not re-expanded

Repo - https://github.com/benhysell/BlazorGridPagingIssue

Example Inspired By - https://docs.telerik.com/blazor-ui/components/treelist/state#save-and-load-treelist-state-from-browser-localstorage

Steps to Reproduce

• Start example project and navigate to https://localhost:5001/TreeListExample
• There is one top level, four elements at the second level, with two of those children that also have children
• Expand a few elements, say Top and Child A
• Navigate away to the home page
• Navigate back to https://localhost:5001/TreeListExample
• All elements are collapsed and only the top level item is shown.

Expected behavior - Elements that had been expanded would be expanded again.

Details

Following the example https://docs.telerik.com/blazor-ui/components/treelist/state#save-and-load-treelist-state-from-browser-localstorage I copied the code into my application, however I wanted to save which items were expanded, so I commented out:

 state.ExpandedItems = null;

Looking at the resulting entries in local storage, it appears the ExpandedItems list is properly saved to local storage.

I added some logging to the OnStateInitHandler so I could see what was happening on load, my desired result was to ensure:

• If there is nothing in local storage, collapse all items
• If someone had stored some information in local storage use it

It appears everything is going out to local storage, and coming back in without issue, however the state of the expanded items is not reflected in the control.

I use Guids to identify data in my application. It is a lot more reliable than using integers; however, it appears as if the TreeList does not support the use of Guids for the Id and ParentId fields when building the list's view.

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ADMIN EDIT

This was not a bug, it was probably a configuration issue, as the scenario works, so this is marked as "declined". See the thread below for a sample.

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