ChipField: Check chips for Required validation - #660

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/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea, actions/setup-dotnet@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Dereference of a possibly null reference.

Possible null reference argument for parameter 'callback' in 'EventCallback<MouseEventArgs> EventCallbackFactory.Create<MouseEventArgs>(object receiver, Func<Task> callback)'.

Possible null reference argument for parameter 'callback' in 'EventCallback<MouseEventArgs> EventCallbackFactory.Create<MouseEventArgs>(object receiver, Action callback)'.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Non-nullable field '_timeHourFormat' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the field as nullable.

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.

Converting method group 'OnDoubleClick' to non-delegate type 'object'. Did you intend to invoke the method?

Possible null reference argument for parameter 'arg' in 'ICollection<T?> Func<ICollection<T?>, ICollection<T?>>.Invoke(ICollection<T?> arg)'.

Possible null reference argument for parameter 'arg' in 'ICollection<T?> Func<ICollection<T?>, ICollection<T?>>.Invoke(ICollection<T?> arg)'.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Nullability of reference types in type of parameter 'sender' of 'void MudWatch.Elapse(object sender, ElapsedEventArgs args)' doesn't match the target delegate 'ElapsedEventHandler' (possibly because of nullability attributes).

Dereference of a possibly null reference.