public override void OnMerge(TWindow window, IWindowOnMergeContext ctx) => NestedTrigger.OnMerge(window, ctx);
/// <summary>
/// Called when several windows have been merged into one window by the <see cref="WindowAssigner{TElement,TWindow}"/>.
/// </summary>
/// <param name="window">The new window that results from the merge.</param>
/// <param name="ctx">A context object that can be used to register timer callbacks and access state.</param>
public virtual void OnMerge(TWindow window, IWindowOnMergeContext ctx) => throw new InvalidOperationException("This trigger does not support merging.");
