/// <summary>
/// Queries a VisualElement for a descendant that matches some criteria. Same as VisualElement.SafeQ(),
/// but throws when no element is found or <paramref name="e"/> is null.
/// </summary>
/// <param name="e">The VisualElement to search.</param>
/// <param name="name">The name of the descendant to find. Null if this criterion should be ignored.</param>
/// <param name="className">The USS class name of the descendant to find. Null if this criterion should be ignored.</param>
/// <returns>The VisualElement that matches the search criteria.</returns>
/// <exception cref="ArgumentNullException">If <paramref name="e"/> is null.</exception>
/// <exception cref="Exception">If no element is found.</exception>
public static VisualElement MandatoryQ(this VisualElement e, string name = null, string className = null)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
return(GraphViewStaticBridge.MandatoryQ(e, name, className));
}
