Recursive functions cause infinite tree in VS Code’s call hierarchy view

Context at dart-lang/sdk#61213.

Say you have these functions:

This is the current UI for Show Call Hierarchy:

But since foo calls itself, we can go on forever like:

This can make the visualisation really confusing, and I'd like to request that you add an icon or something to identify the function calls itself rather than making it open for ever in this tree.

I do understand that if foo called bar we would get the same behaviour but I guess if we could simplify the most basic case it would be enough.