No way to detect error or exit out from a patch_stdout situation externally

Let's assume two programs here, both of which are connected to each other with asynchronous communication.

The first one has this in its code.

from prompt_toolkit import PromptSession
from prompt_toolkit.patch_stdout import patch_stdout

async def my_coroutine():
    session = PromptSession()
    while True:
        with patch_stdout():
            result = await session.prompt_async('Say something: ')
        print('You said: %s' % result)

And the second one can trigger a

sys.exit()

on the first one.

But here's the thing, the exit - once triggered - is not graceful as even when the first program has apparently exited out, it still remains in the patch_stdout state which means that the nothing turns up on the prompt when being typed.

Start with the PromptSession.prompt_async call and the patch_stdout context used in the issue, then reproduce the behavior when a second program triggers sys.exit() in the first program. Trace how patch_stdout is entered and exited during the asynchronous prompt, and define completion as graceful exit without leaving the prompt in patch_stdout state.