"Upsert" option (create modal if not open, update if is open)

[rikbrown]

I'd like to implement a callable where it can only be opened once - newer invocations replace the old one.

Right now I am doing:

Callable.end()
setTimeout(() => Callable.call(...)) // note: if you don't wrap in setTimeout, it opens v briefly and then the end above closes it

which I presume isn't correct especially given I had to work around the preceding end closing it.

Is there a way to do this I am missing? If not I suppose this is a feature request :)