That'd be a hacky workaround.

The test explorer UI is owned by Microsoft / VS. So worth raising an issue with them.

i am quite sure that they do order those things on purpose, since the test explorer's columns can be sorted - i don't think we can convince them to change that behaviour (and i know that it wouldn't be implemented any time soonish :-P

this is the hacky workaround using a DisplayNameFormatter :-)
btw can i convince you to render a space after the method names before the parentheses in the default implementation of .GetDisplayName()? so i don't need the ugly .Replace?

public class OrderedArgumentsAttribute : DisplayNameFormatterAttribute
{
 static int Counter; // <-- hacky and probably bad, but works for now :-)
 protected override string FormatDisplayName(DiscoveredTestContext context) => $"{Counter++} {context.GetDisplayName().Replace("(", " (")}";
}