WIP: validate virtualized list selection state - #1

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'collection' in 'HashSet<T?>.HashSet(IEnumerable<T?> collection, IEqualityComparer<T?>? comparer)'.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

The type 'T' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'T' doesn't match 'notnull' constraint.

The type 'T' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'T' doesn't match 'notnull' constraint.

The variable 'warning' is assigned but its value is never used

Dereference of a possibly null reference.

'MudFileUpload<IBrowserFile>.InputStyle' is obsolete: 'Prefer the InputClass property with CSS https://github.com/MudBlazor/MudBlazor/issues/12047'

The type 'T' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'T' doesn't match 'notnull' constraint.

The variable 'warning' is assigned but its value is never used

Dereference of a possibly null reference.

'MudFileUpload<IBrowserFile>.InputStyle' is obsolete: 'Prefer the InputClass property with CSS https://github.com/MudBlazor/MudBlazor/issues/12047'

The variable 'warning' is assigned but its value is never used

Dereference of a possibly null reference.

'MudFileUpload<IBrowserFile>.InputStyle' is obsolete: 'Prefer the InputClass property with CSS https://github.com/MudBlazor/MudBlazor/issues/12047'

The variable 'warning' is assigned but its value is never used

Dereference of a possibly null reference.

'MudFileUpload<IBrowserFile>.InputStyle' is obsolete: 'Prefer the InputClass property with CSS https://github.com/MudBlazor/MudBlazor/issues/12047'