Blocking tasks (sync or async) leads to ui frozen about marimo HOT 2 OPEN

I'm not 100% sure i follow the use case - i'll try to digest it more. But in the meantime, have you see the mo.output.replace/mo.output.append/mo.output.clear? The allow you to update the cell output (replace/append/clear) before the cell finished.

e.g.

mo.output.replace(mo.status.spinner(title="loading"))

# do things

mo.ouput.replace(mo.md("First result: ", result)

# do more things

result

https://docs.marimo.io/api/outputs.html#cell-outputs

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It's related to the example given in #1271,
This works when the action (clicking a button), is inexpensive. However, in my use case I am calling a calculation engine, which takes seconds to return the results. Instead of showing the spinner, it doesn't show up and once the output returns it is gone. I'll take a look at the mo.output, maybe that's what I need..

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